自己重新整理攒一个 SqlHelper.v3.1.cs 备用! (纯属抄袭)

//Data Access Application Block 3.1
// http://www.gotdotnet.com/workspaces/workspace.aspx?id=c20d12b0-af52-402b-9b7c-aaeb21d1f431
// SqlHelper.v3.1.cs
//csc.exe SqlHelper.v3.1.cs /t:library /r:C:/WINNT/Microsoft.NET/Framework/v1.1.4322/System.Data.OracleClient.dll

namespace Microshaoft.Data
{
using System;
using System.IO;
using System.Data;
using System.Xml;
using System.Data.SqlClient;
using System.Data.Odbc;
using System.Data.OleDb;
using System.Data.OracleClient;
using System.Data.Common;
using System.Collections;
using System.Configuration;
using System.Text;
using System.Text.RegularExpressions;
using System.Reflection;
using System.Diagnostics;

/// <summary>
/// The AdoHelper class is intended to encapsulate high performance, scalable best practices for
/// common data access uses.   It uses the Abstract Factory pattern to be easily extensible
/// to any ADO.NET provider. The current implementation provides helpers for SQL Server, ODBC,
/// OLEDB, and Oracle.
/// </summary>
public abstract class AdoHelper
{
  /// <summary>
  /// This enum is used to indicate whether the connection was provided by the caller, or created by AdoHelper, so that
  /// we can set the appropriate CommandBehavior when calling ExecuteReader()
  /// </summary>
  protected enum AdoConnectionOwnership
  {
   /// <summary>Connection is owned and managed by ADOHelper</summary>
   Internal,
   /// <summary>Connection is owned and managed by the caller</summary>
   External
  }

#region Declare members

  // necessary for handling the general case of needing event handlers for RowUpdating/ed events
  /// <summary>
  /// Internal handler used for bubbling up the event to the user
  /// </summary>
  protected RowUpdatingHandler m_rowUpdating;

  /// <summary>
  /// Internal handler used for bubbling up the event to the user
  /// </summary>
  protected RowUpdatedHandler m_rowUpdated;

#endregion

#region Provider specific abstract methods

  /// <summary>
  /// Returns an IDbConnection object for the given connection string
  /// </summary>
  /// <param name="connectionString">The connection string to be used to create the connection</param>
  /// <returns>An IDbConnection object</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  public abstract IDbConnection GetConnection(string connectionString);

  /// <summary>
  /// Returns an IDbDataAdapter object
  /// </summary>
  /// <returns>The IDbDataAdapter</returns>
  public abstract IDbDataAdapter GetDataAdapter();

  /// <summary>
  /// Calls the CommandBuilder.DeriveParameters method for the specified provider, doing any setup and cleanup necessary
  /// </summary>
  /// <param name="cmd">The IDbCommand referencing the stored procedure from which the parameter information is to be derived. The derived parameters are added to the Parameters collection of the IDbCommand. </param>
  public abstract void DeriveParameters(IDbCommand cmd);

  /// <summary>
  /// Returns an IDataParameter object
  /// </summary>
  /// <returns>The IDataParameter object</returns>
  public abstract IDataParameter GetParameter();

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the provided IDbConnection.
  /// </summary>
  /// <example>
  /// <code>
  /// XmlReader r = helper.ExecuteXmlReader(command);
  /// </code></example>
  /// <param name="cmd">The IDbCommand to execute</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  public abstract XmlReader ExecuteXmlReader(IDbCommand cmd);

  /// <summary>
  /// Provider specific code to set up the updating/ed event handlers used by UpdateDataset
  /// </summary>
  /// <param name="dataAdapter">DataAdapter to attach the event handlers to</param>
  /// <param name="rowUpdatingHandler">The handler to be called when a row is updating</param>
  /// <param name="rowUpdatedHandler">The handler to be called when a row is updated</param>
  protected abstract void AddUpdateEventHandlers(IDbDataAdapter dataAdapter, RowUpdatingHandler rowUpdatingHandler, RowUpdatedHandler rowUpdatedHandler);

  /// <summary>
  /// Returns an array of IDataParameters of the specified size
  /// </summary>
  /// <param name="size">size of the array</param>
  /// <returns>The array of IDataParameters</returns>
  protected abstract IDataParameter[] GetDataParameters(int size);

  /// <summary>
  /// Handle any provider-specific issues with BLOBs here by "washing" the IDataParameter and returning a new one that is set up appropriately for the provider.
  /// </summary>
  /// <param name="connection">The IDbConnection to use in cleansing the parameter</param>
  /// <param name="p">The parameter before cleansing</param>
  /// <returns>The parameter after it's been cleansed.</returns>
  protected abstract IDataParameter GetBlobParameter(IDbConnection connection, IDataParameter p);

#endregion

#region Delegates

  // also used in our general case of RowUpdating/ed events
  /// <summary>
  /// Delegate for creating a RowUpdatingEvent handler
  /// </summary>
  /// <param name="obj">The object that published the event</param>
  /// <param name="e">The RowUpdatingEventArgs for the event</param>
  public delegate void RowUpdatingHandler(object obj, RowUpdatingEventArgs e);

  /// <summary>
  /// Delegate for creating a RowUpdatedEvent handler
  /// </summary>
  /// <param name="obj">The object that published the event</param>
  /// <param name="e">The RowUpdatedEventArgs for the event</param>
  public delegate void RowUpdatedHandler(object obj, RowUpdatedEventArgs e);

#endregion

#region Factory

  /// <summary>
  /// Create an AdoHelper for working with a specific provider (i.e. Sql, Odbc, OleDb, Oracle)
  /// </summary>
  /// <param name="providerAssembly">Assembly containing the specified helper subclass</param>
  /// <param name="providerType">Specific type of the provider</param>
  /// <returns>An AdoHelper instance of the specified type</returns>
  /// <example><code>
  /// AdoHelper helper = AdoHelper.CreateHelper("GotDotNet.ApplicationBlocks.Data", "GotDotNet.ApplicationBlocks.Data.OleDb");
  /// </code></example>
  public static AdoHelper CreateHelper(string providerAssembly, string providerType)
  {
   Assembly assembly = Assembly.Load(providerAssembly);
   object provider = assembly.CreateInstance(providerType);
   if (provider is AdoHelper)
   {
    return provider as AdoHelper;
   }
   else
   {
    throw new InvalidOperationException("The provider specified does not extend the AdoHelper abstract class.");
   }
  }

  /// <summary>
  /// Create an AdoHelper instance for working with a specific provider by using a providerAlias specified in the App.Config file.
  /// </summary>
  /// <param name="providerAlias">The alias to look up</param>
  /// <returns>An AdoHelper instance of the specified type</returns>
  /// <example><code>
  /// AdoHelper helper = AdoHelper.CreateHelper("OracleHelper");
  /// </code></example>
  public static AdoHelper CreateHelper(string providerAlias)
  {
   IDictionary dict;
   try
   {
    dict = ConfigurationSettings.GetConfig("daabProviders") as IDictionary;
   }
   catch (Exception e)
   {
    throw new InvalidOperationException("If the section is not defined on the configuration file this method can't be used to create an AdoHelper instance.", e);
   }

   ProviderAlias providerConfig = dict[providerAlias] as ProviderAlias;
   string providerAssembly = providerConfig.AssemblyName;
   string providerType = providerConfig.TypeName;

   Assembly assembly = Assembly.Load(providerAssembly);
   object provider = assembly.CreateInstance(providerType);
   if (provider is AdoHelper)
   {
    return provider as AdoHelper;
   }
   else
   {
    throw new InvalidOperationException("The provider specified does not extends the AdoHelper abstract class.");
   }
  }

#endregion

#region GetParameter

  /// <summary>
  /// Get an IDataParameter for use in a SQL command
  /// </summary>
  /// <param name="name">The name of the parameter to create</param>
  /// <param name="value">The value of the specified parameter</param>
  /// <returns>An IDataParameter object</returns>
  public virtual IDataParameter GetParameter(string name, object value)
  {
   IDataParameter parameter = GetParameter();
   parameter.ParameterName = name;
   parameter.Value = value;

return parameter;
}

  /// <summary>
  /// Get an IDataParameter for use in a SQL command
  /// </summary>
  /// <param name="name">The name of the parameter to create</param>
  /// <param name="dbType">The System.Data.DbType of the parameter</param>
  /// <param name="size">The size of the parameter</param>
  /// <param name="direction">The System.Data.ParameterDirection of the parameter</param>
  /// <returns>An IDataParameter object</returns>
  public virtual IDataParameter GetParameter(string name, DbType dbType, int size, ParameterDirection direction)
  {
   IDataParameter dataParameter = GetParameter();
   dataParameter.DbType = dbType;
   dataParameter.Direction = direction;
   dataParameter.ParameterName = name;

   if (size > 0 && dataParameter is IDbDataParameter)
   {
    IDbDataParameter dbDataParameter = (IDbDataParameter) dataParameter;
    dbDataParameter.Size = size;
   }
   return dataParameter;
  }

  /// <summary>
  /// Get an IDataParameter for use in a SQL command
  /// </summary>
  /// <param name="name">The name of the parameter to create</param>
  /// <param name="dbType">The System.Data.DbType of the parameter</param>
  /// <param name="size">The size of the parameter</param>
  /// <param name="sourceColumn">The source column of the parameter</param>
  /// <param name="sourceVersion">The System.Data.DataRowVersion of the parameter</param>
  /// <returns>An IDataParameter object</returns>
  public virtual IDataParameter GetParameter(string name, DbType dbType, int size, string sourceColumn, DataRowVersion sourceVersion)
  {
   IDataParameter dataParameter = GetParameter();
   dataParameter.DbType = dbType;
   dataParameter.ParameterName = name;
   dataParameter.SourceColumn = sourceColumn;
   dataParameter.SourceVersion = sourceVersion;

   if (size > 0 && dataParameter is IDbDataParameter)
   {
    IDbDataParameter dbDataParameter = (IDbDataParameter) dataParameter;
    dbDataParameter.Size = size;
   }
   return dataParameter;
  }

#endregion

#region private utility methods

  /// <summary>
  /// This method is used to attach array of IDataParameters to an IDbCommand.
  ///
  /// This method will assign a value of DbNull to any parameter with a direction of
  /// InputOutput and a value of null.
  ///
  /// This behavior will prevent default values from being used, but
  /// this will be the less common case than an intended pure output parameter (derived as InputOutput)
  /// where the user provided no input value.
  /// </summary>
  /// <param name="command">The command to which the parameters will be added</param>
  /// <param name="commandParameters">An array of IDataParameterParameters to be added to command</param>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  protected virtual void AttachParameters(IDbCommand command, IDataParameter[] commandParameters)
  {
   if (command == null) throw new ArgumentNullException("command");
   if (commandParameters != null)
   {
    foreach (IDataParameter p in commandParameters)
    {
     if (p != null)
     {
      // Check for derived output value with no value assigned
      if ((p.Direction == ParameterDirection.InputOutput ||
       p.Direction == ParameterDirection.Input) &&
       (p.Value == null))
      {
       p.Value = DBNull.Value;
      }
      if (p.DbType == DbType.Binary)
      {
       // special handling for BLOBs
       command.Parameters.Add(GetBlobParameter(command.Connection, p));
      }
      else
      {
       command.Parameters.Add(p);
      }
     }
    }
   }
  }

  /// <summary>
  /// This method assigns dataRow column values to an IDataParameterCollection
  /// </summary>
  /// <param name="commandParameters">The IDataParameterCollection to be assigned values</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the parameter names are invalid.</exception>
  protected internal void AssignParameterValues(IDataParameterCollection commandParameters, DataRow dataRow)
  {
   if (commandParameters == null || dataRow == null)
   {
    // Do nothing if we get no data
    return;
   }

DataColumnCollection columns = dataRow.Table.Columns;

   int i = 0;
   // Set the parameters values
   foreach (IDataParameter commandParameter in commandParameters)
   {
    // Check the parameter name
    if (commandParameter.ParameterName == null ||
     commandParameter.ParameterName.Length <= 1)
     throw new InvalidOperationException(string.Format(
      "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",
      i, commandParameter.ParameterName));

    if (columns.Contains(commandParameter.ParameterName))
     commandParameter.Value = dataRow[commandParameter.ParameterName];
    else if (columns.Contains(commandParameter.ParameterName.Substring(1)))
     commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];

    i++;
   }
  }

  /// <summary>
  /// This method assigns dataRow column values to an array of IDataParameters
  /// </summary>
  /// <param name="commandParameters">Array of IDataParameters to be assigned values</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the parameter names are invalid.</exception>
  protected void AssignParameterValues(IDataParameter[] commandParameters, DataRow dataRow)
  {
   if ((commandParameters == null) || (dataRow == null))
   {
    // Do nothing if we get no data
    return;
   }

DataColumnCollection columns = dataRow.Table.Columns;

    i++;
   }
  }

  /// <summary>
  /// This method assigns an array of values to an array of IDataParameters
  /// </summary>
  /// <param name="commandParameters">Array of IDataParameters to be assigned values</param>
  /// <param name="parameterValues">Array of objects holding the values to be assigned</param>
  /// <exception cref="System.ArgumentException">Thrown if an incorrect number of parameters are passed.</exception>
  protected void AssignParameterValues(IDataParameter[] commandParameters, object[] parameterValues)
  {
   if ((commandParameters == null) || (parameterValues == null))
   {
    // Do nothing if we get no data
    return;
   }

   // We must have the same number of values as we pave parameters to put them in
   if (commandParameters.Length != parameterValues.Length)
   {
    throw new ArgumentException("Parameter count does not match Parameter Value count.");
   }

   // Iterate through the IDataParameters, assigning the values from the corresponding position in the
   // value array
   for (int i = 0, j = commandParameters.Length, k = 0; i < j; i++)
   {
    if (commandParameters[i].Direction != ParameterDirection.ReturnValue)
    {
     // If the current array value derives from IDataParameter, then assign its Value property
     if (parameterValues[k] is IDataParameter)
     {
      IDataParameter paramInstance;
      paramInstance = (IDataParameter) parameterValues[k];
      if (paramInstance.Direction == ParameterDirection.ReturnValue)
      {
       paramInstance = (IDataParameter) parameterValues[++k];
      }
      if (paramInstance.Value == null)
      {
       commandParameters[i].Value = DBNull.Value;
      }
      else
      {
       commandParameters[i].Value = paramInstance.Value;
      }
     }
     else if (parameterValues[k] == null)
     {
      commandParameters[i].Value = DBNull.Value;
     }
     else
     {
      commandParameters[i].Value = parameterValues[k];
     }
     k++;
    }
   }
  }

  /// <summary>
  /// This method cleans up the parameter syntax for the provider
  /// </summary>
  /// <param name="command">The IDbCommand containing the parameters to clean up.</param>
  public virtual void CleanParameterSyntax(IDbCommand command)
  {
   // do nothing by default
  }

  /// <summary>
  /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters
  /// to the provided command
  /// </summary>
  /// <param name="command">The IDbCommand to be prepared</param>
  /// <param name="connection">A valid IDbConnection, on which to execute this command</param>
  /// <param name="transaction">A valid IDbTransaction, or 'null'</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters to be associated with the command or 'null' if no parameters are required</param>
  /// <param name="mustCloseConnection"><c>true</c> if the connection was opened by the method, otherwose is false.</param>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null.</exception>
  protected virtual void PrepareCommand(IDbCommand command, IDbConnection connection, IDbTransaction transaction, CommandType commandType, string commandText, IDataParameter[] commandParameters, out bool mustCloseConnection)
  {
   if (command == null) throw new ArgumentNullException("command");
   if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

   // If the provided connection is not open, we will open it
   if (connection.State != ConnectionState.Open)
   {
    mustCloseConnection = true;
    connection.Open();
   }
   else
   {
    mustCloseConnection = false;
   }

// Associate the connection with the command
command.Connection = connection;

// Set the command text (stored procedure name or SQL statement)
command.CommandText = commandText;

   // If we were provided a transaction, assign it
   if (transaction != null)
   {
    if (transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
    command.Transaction = transaction;
   }

// Set the command type
command.CommandType = commandType;

   // Attach the command parameters if they are provided
   if (commandParameters != null)
   {
    AttachParameters(command, commandParameters);
   }
   return;
  }

  /// <summary>
  /// This method clears (if necessary) the connection, transaction, command type and parameters
  /// from the provided command
  /// </summary>
  /// <remarks>
  /// Not implemented here because the behavior of this method differs on each data provider.
  /// </remarks>
  /// <param name="command">The IDbCommand to be cleared</param>
  protected virtual void ClearCommand(IDbCommand command)
  {
   // do nothing by default
  }

#endregion private utility methods

#region ExecuteDataset

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the database specified in
  /// the connection string.
  /// </summary>
  /// <param name="command">The IDbCommand object to use</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  public virtual DataSet ExecuteDataset(IDbCommand command)
  {
   bool mustCloseConnection = false;

// Clean Up Parameter Syntax
CleanParameterSyntax(command);

   if (command.Connection.State != ConnectionState.Open)
   {
    command.Connection.Open();
    mustCloseConnection = true;
   }

   // Create the DataAdapter & DataSet
   IDbDataAdapter da = null;
   try
   {
    da = GetDataAdapter();
    da.SelectCommand = command;

DataSet ds = new DataSet();

    try
    {
     // Fill the DataSet using default values for DataTable names, etc
     da.Fill(ds);
    }
    catch (Exception ex)
    {
     // Don't just throw ex. It changes the call stack. But we want the ex around for debugging, so...
     Debug.WriteLine(ex);
     throw;
    }

    // Detach the IDataParameters from the command object, so they can be used again
    // Don't do this...screws up output params -- cjb
    //command.Parameters.Clear();

    // Return the DataSet
    return ds;
   }
   finally
   {
    if (mustCloseConnection)
    {
     command.Connection.Close();
    }
    if (da != null)
    {
     IDisposable id = da as IDisposable;
     if (id != null)
      id.Dispose();
    }
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <example>
  /// <code>
  /// DataSet ds = helper.ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
  /// </code></example>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  public virtual DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteDataset(connectionString, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <example>
  /// <code>
  /// DataSet ds = helper.ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new IDbParameter("@prodid", 24));
  /// </code></example>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDbParamters used to execute the command</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  public virtual DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

   // Create & open an IDbConnection, and dispose of it after we are done
   using (IDbConnection connection = GetConnection(connectionString))
   {
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    return ExecuteDataset(connection, commandType, commandText, commandParameters);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the database specified in
  /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// DataSet ds = helper.ExecuteDataset(connString, "GetOrders", 24, 36);
  /// </code></example>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  public virtual DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    IDataParameter[] iDataParameterValues = GetDataParameters(parameterValues.Length);

    // if we've been passed IDataParameters, don't do parameter discovery
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(connectionString, spName, includeReturnValue);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

     // Call the overload that takes an array of IDataParameters
     return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset and takes no parameters) against the provided IDbConnection.
  /// </summary>
  /// <example>
  /// <code>
  /// DataSet ds = helper.ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual DataSet ExecuteDataset(IDbConnection connection, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteDataset(connection, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the provided parameters.
  /// </summary>
  /// <example>
  /// <code>
  /// DataSet ds = helper.ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new IDataParameter("@prodid", 24));
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual DataSet ExecuteDataset(IDbConnection connection, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (connection == null) throw new ArgumentNullException("connection");

   // Create a command and prepare it for execution
   IDbCommand cmd = connection.CreateCommand();
   bool mustCloseConnection = false;
   PrepareCommand(cmd, connection, (IDbTransaction) null, commandType, commandText, commandParameters, out mustCloseConnection);
   CleanParameterSyntax(cmd);

DataSet ds = ExecuteDataset(cmd);

if (mustCloseConnection)
connection.Close();

   // Return the DataSet
   return ds;
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// DataSet ds = helper.ExecuteDataset(conn, "GetOrders", 24, 36);
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual DataSet ExecuteDataset(IDbConnection connection, string spName, params object[] parameterValues)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discovery
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteDataset(connection, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(connection, spName, includeReturnValue);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

     // Call the overload that takes an array of IDataParameters
     return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset and takes no parameters) against the provided IDbTransaction.
  /// </summary>
  /// <example><code>
  /// DataSet ds = helper.ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual DataSet ExecuteDataset(IDbTransaction transaction, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteDataset(transaction, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the specified IDbTransaction
  /// using the provided parameters.
  /// </summary>
  /// <example>
  /// <code>
  /// DataSet ds = helper.ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new IDataParameter("@prodid", 24));
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual DataSet ExecuteDataset(IDbTransaction transaction, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");

   // Create a command and prepare it for execution
   IDbCommand cmd = transaction.Connection.CreateCommand();
   bool mustCloseConnection = false;
   PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
   CleanParameterSyntax(cmd);

return ExecuteDataset(cmd);

}

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified
  /// IDbTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// DataSet ds = helper.ExecuteDataset(tran, "GetOrders", 24, 36);
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual DataSet ExecuteDataset(IDbTransaction transaction, string spName, params object[] parameterValues)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discovery
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(transaction.Connection, spName, includeReturnValue);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

     // Call the overload that takes an array of IDataParameters
     return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
   }
  }

#endregion ExecuteDataset

#region ExecuteNonQuery

  /// <summary>
  /// Execute an IDbCommand (that returns no resultset) against the database
  /// </summary>
  /// <param name="command">The IDbCommand to execute</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  public virtual int ExecuteNonQuery(IDbCommand command)
  {
   bool mustCloseConnection = false;

// Clean Up Parameter Syntax
CleanParameterSyntax(command);

   if (command.Connection.State != ConnectionState.Open)
   {
    command.Connection.Open();
    mustCloseConnection = true;
   }

if (command == null) throw new ArgumentNullException("command");

int returnVal;

returnVal = command.ExecuteNonQuery();

   if (mustCloseConnection)
   {
    command.Connection.Close();
   }

return returnVal;
}

  /// <summary>
  /// Execute an IDbCommand (that returns no resultset and takes no parameters) against the database specified in
  /// the connection string
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  public virtual int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteNonQuery(connectionString, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns no resultset) against the database specified in the connection string
  /// using the provided parameters
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  public virtual int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

   // Create & open an IDbConnection, and dispose of it after we are done
   using (IDbConnection connection = GetConnection(connectionString))
   {
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns no resultset) against the database specified in
  /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// </remarks>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored prcedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  public virtual int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discoveryu
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(connectionString, spName, includeReturnValue);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

     // Call the overload that takes an array of IDataParameters
     return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns no resultset and takes no parameters) against the provided IDbConnection.
  /// </summary>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual int ExecuteNonQuery(IDbConnection connection, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteNonQuery(connection, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns no resultset) against the specified IDbConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// </remarks>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDbParamters used to execute the command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual int ExecuteNonQuery(IDbConnection connection, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (connection == null) throw new ArgumentNullException("connection");

// Finally, execute the command
int retval = ExecuteNonQuery(cmd);

   // Detach the IDataParameters from the command object, so they can be used again
   // don't do this...screws up output parameters -- cjbreisch
   // cmd.Parameters.Clear();
   if (mustCloseConnection)
    connection.Close();
   return retval;
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns no resultset) against the specified IDbConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// </remarks>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual int ExecuteNonQuery(IDbConnection connection, string spName, params object[] parameterValues)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discoveryu
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(connection, spName, includeReturnValue);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

     // Call the overload that takes an array of IDataParameters
     return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns no resultset and takes no parameters) against the provided IDbTransaction.
  /// </summary>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual int ExecuteNonQuery(IDbTransaction transaction, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteNonQuery(transaction, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns no resultset) against the specified IDbTransaction
  /// using the provided parameters.
  /// </summary>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual int ExecuteNonQuery(IDbTransaction transaction, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");

// Finally, execute the command
int retval = ExecuteNonQuery(cmd);

   // Detach the IDataParameters from the command object, so they can be used again
   // don't do this...screws up output parameters -- cjbreisch
   // cmd.Parameters.Clear();
   return retval;
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns no resultset) against the specified
  /// IDbTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual int ExecuteNonQuery(IDbTransaction transaction, string spName, params object[] parameterValues)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discoveryu
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(transaction.Connection, spName, includeReturnValue);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

     // Call the overload that takes an array of IDbParameters
     return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
   }
  }

#endregion ExecuteNonQuery

#region ExecuteReader

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the database specified in
  /// the connection string.
  /// </summary>
  /// <param name="command">The IDbCommand object to use</param>
  /// <returns>A IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  public virtual IDataReader ExecuteReader(IDbCommand command)
  {
   return ExecuteReader(command, AdoConnectionOwnership.External);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the database specified in
  /// the connection string.
  /// </summary>
  /// <param name="command">The IDbCommand object to use</param>
  /// <param name="connectionOwnership">Enum indicating whether the connection was created internally or externally.</param>
  /// <returns>A IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  protected virtual IDataReader ExecuteReader(IDbCommand command, AdoConnectionOwnership connectionOwnership)
  {
   // Clean Up Parameter Syntax
   CleanParameterSyntax(command);

   if (command.Connection.State != ConnectionState.Open)
   {
    command.Connection.Open();
    connectionOwnership = AdoConnectionOwnership.Internal;
   }

// Create a reader
IDataReader dataReader;

   // Call ExecuteReader with the appropriate CommandBehavior
   if (connectionOwnership == AdoConnectionOwnership.External)
   {
    dataReader = command.ExecuteReader();
   }
   else
   {
    try
    {
     dataReader = command.ExecuteReader(CommandBehavior.CloseConnection);
    }
    catch (Exception ex)
    {
     // Don't just throw ex. It changes the call stack. But we want the ex around for debugging, so...
     Debug.WriteLine(ex);
     throw;
    }
   }

ClearCommand(command);

return dataReader;
}

  /// <summary>
  /// Create and prepare an IDbCommand, and call ExecuteReader with the appropriate CommandBehavior.
  /// </summary>
  /// <remarks>
  /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
  ///
  /// If the caller provided the connection, we want to leave it to them to manage.
  /// </remarks>
  /// <param name="connection">A valid IDbConnection, on which to execute this command</param>
  /// <param name="transaction">A valid IDbTransaction, or 'null'</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters to be associated with the command or 'null' if no parameters are required</param>
  /// <param name="connectionOwnership">Indicates whether the connection parameter was provided by the caller, or created by AdoHelper</param>
  /// <returns>IDataReader containing the results of the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  private IDataReader ExecuteReader(IDbConnection connection, IDbTransaction transaction, CommandType commandType, string commandText, IDataParameter[] commandParameters, AdoConnectionOwnership connectionOwnership)
  {
   if (connection == null) throw new ArgumentNullException("connection");

   bool mustCloseConnection = false;
   // Create a command and prepare it for execution
   IDbCommand cmd = connection.CreateCommand();
   try
   {
    PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
    CleanParameterSyntax(cmd);

    // override conenctionOwnership if we created the connection in PrepareCommand -- cjbreisch
    if (mustCloseConnection)
    {
     connectionOwnership = AdoConnectionOwnership.Internal;
    }

// Create a reader
IDataReader dataReader;

dataReader = ExecuteReader(cmd, connectionOwnership);

ClearCommand(cmd);

    return dataReader;
   }
   catch
   {
    if (mustCloseConnection)
     connection.Close();
    throw;
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>A IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  public virtual IDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteReader(connectionString, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <returns>A IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  public virtual IDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   IDbConnection connection = null;
   try
   {
    connection = GetConnection(connectionString);
    connection.Open();

    // Call the private overload that takes an internally owned connection in place of the connection string
    return ExecuteReader(connection, null, commandType, commandText, commandParameters, AdoConnectionOwnership.Internal);
   }
   catch
   {
    // If we fail to return the IDataReader, we need to close the connection ourselves
    if (connection != null) connection.Close();
    throw;
   }

}

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the database specified in
  /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// IDataReader dr = helper.ExecuteReader(connString, "GetOrders", 24, 36);
  /// </code></example>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>an IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  public virtual IDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discovery
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(connectionString, spName, includeReturnValue);

AssignParameterValues(commandParameters, parameterValues);

     return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset and takes no parameters) against the provided IDbConnection.
  /// </summary>
  /// <example>
  /// <code>
  /// IDataReader dr = helper.ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>an IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  public virtual IDataReader ExecuteReader(IDbConnection connection, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteReader(connection, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the provided parameters.
  /// </summary>
  /// <example>
  /// <code>
  /// IDataReader dr = helper.ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new IDataParameter("@prodid", 24));
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <returns>an IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual IDataReader ExecuteReader(IDbConnection connection, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   // Pass through the call to the private overload using a null transaction value and an externally owned connection
   return ExecuteReader(connection, (IDbTransaction) null, commandType, commandText, commandParameters, AdoConnectionOwnership.External);
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// IDataReader dr = helper.ExecuteReader(conn, "GetOrders", 24, 36);
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>an IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual IDataReader ExecuteReader(IDbConnection connection, string spName, params object[] parameterValues)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discovery
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteReader(connection, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(connection, spName, includeReturnValue);

AssignParameterValues(commandParameters, parameterValues);

     return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteReader(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset and takes no parameters) against the provided IDbTransaction.
  /// </summary>
  /// <example><code>
  /// IDataReader dr = helper.ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>A IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  public virtual IDataReader ExecuteReader(IDbTransaction transaction, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteReader(transaction, commandType, commandText, (IDataParameter[]) null);
  }

   // Pass through to private overload, indicating that the connection is owned by the caller
   return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, AdoConnectionOwnership.External);
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified
  /// IDbTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// IDataReader dr = helper.ExecuteReader(tran, "GetOrders", 24, 36);
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>an IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual IDataReader ExecuteReader(IDbTransaction transaction, string spName, params object[] parameterValues)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discovery
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteReader(transaction, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(transaction.Connection, spName, includeReturnValue);

AssignParameterValues(commandParameters, parameterValues);

     return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
   }
  }

#endregion ExecuteReader

#region ExecuteScalar

  /// <summary>
  /// Execute an IDbCommand (that returns a 1x1 resultset) against the database specified in
  /// the connection string.
  /// </summary>
  /// <param name="command">The IDbCommand to execute</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  public virtual object ExecuteScalar(IDbCommand command)
  {
   bool mustCloseConnection = false;

// Clean Up Parameter Syntax
CleanParameterSyntax(command);

   if (command.Connection.State != ConnectionState.Open)
   {
    command.Connection.Open();
    mustCloseConnection = true;
   }

// Execute the command & return the results
object retval = command.ExecuteScalar();

   // Detach the IDataParameters from the command object, so they can be used again
   // don't do this...screws up output params -- cjbreisch
   // command.Parameters.Clear();

   if (mustCloseConnection)
   {
    command.Connection.Close();
   }

return retval;
}

  /// <summary>
  /// Execute an IDbCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <example>
  /// <code>
  /// int orderCount = (int)helper.ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
  /// </code></example>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  public virtual object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteScalar(connectionString, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a 1x1 resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  public virtual object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   // Create & open an IDbConnection, and dispose of it after we are done
   IDbConnection connection = null;
   try
   {
    connection = GetConnection(connectionString);
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    return ExecuteScalar(connection, commandType, commandText, commandParameters);
   }
   finally
   {
    IDisposable id = connection as IDisposable;
    if (id != null) id.Dispose();
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a 1x1 resultset) against the database specified in
  /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// int orderCount = (int)helper.ExecuteScalar(connString, "GetOrderCount", 24, 36);
  /// </code></example>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  public virtual object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discovery
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(connectionString, spName, includeReturnValue);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

     // Call the overload that takes an array of IDataParameters
     return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a 1x1 resultset and takes no parameters) against the provided IDbConnection.
  /// </summary>
  /// <example>
  /// <code>
  /// int orderCount = (int)helper.ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  public virtual object ExecuteScalar(IDbConnection connection, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDbParameters
   return ExecuteScalar(connection, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a 1x1 resultset) against the specified IDbConnection
  /// using the provided parameters.
  /// </summary>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual object ExecuteScalar(IDbConnection connection, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (connection == null) throw new ArgumentNullException("connection");

// Create a command and prepare it for execution
IDbCommand cmd = connection.CreateCommand();

   bool mustCloseConnection = false;
   PrepareCommand(cmd, connection, (IDbTransaction) null, commandType, commandText, commandParameters, out mustCloseConnection);
   CleanParameterSyntax(cmd);

// Execute the command & return the results
object retval = ExecuteScalar(cmd);

   // Detach the IDataParameters from the command object, so they can be used again
   // don't do this...screws up output parameters -- cjbreisch
   // cmd.Parameters.Clear();

if (mustCloseConnection)
connection.Close();

return retval;
}

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a 1x1 resultset) against the specified IDbConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// int orderCount = (int)helper.ExecuteScalar(conn, "GetOrderCount", 24, 36);
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual object ExecuteScalar(IDbConnection connection, string spName, params object[] parameterValues)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discovery
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteScalar(connection, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(connection, spName, includeReturnValue);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

     // Call the overload that takes an array of IDataParameters
     return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a 1x1 resultset and takes no parameters) against the provided IDbTransaction.
  /// </summary>
  /// <example>
  /// <code>
  /// int orderCount = (int)helper.ExecuteScalar(tran, CommandType.StoredProcedure, "GetOrderCount");
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  public virtual object ExecuteScalar(IDbTransaction transaction, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteScalar(transaction, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a 1x1 resultset) against the specified IDbTransaction
  /// using the provided parameters.
  /// </summary>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDbParamters used to execute the command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual object ExecuteScalar(IDbTransaction transaction, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");

// Execute the command & return the results
object retval = ExecuteScalar(cmd);

   // Detach the IDataParameters from the command object, so they can be used again
   // don't do this...screws up output parameters -- cjbreisch
   // cmd.Parameters.Clear();
   return retval;
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a 1x1 resultset) against the specified
  /// IDbTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// int orderCount = (int)helper.ExecuteScalar(tran, "GetOrderCount", 24, 36);
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the transaction is rolled back or commmitted</exception>
  public virtual object ExecuteScalar(IDbTransaction transaction, string spName, params object[] parameterValues)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discovery
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, iDataParameterValues);
    }
    else
    {
     // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(transaction.Connection, spName, includeReturnValue);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

     // Call the overload that takes an array of IDataParameters
     return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
   }
  }

#endregion ExecuteScalar

#region ExecuteXmlReader

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset and takes no parameters) against the provided IDbConnection.
  /// </summary>
  /// <example>
  /// <code>
  /// XmlReader r = helper.ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command using "FOR XML AUTO"</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public XmlReader ExecuteXmlReader(IDbConnection connection, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteXmlReader(connection, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the provided parameters.
  /// </summary>
  /// <example>
  /// <code>
  /// XmlReader r = helper.ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", GetParameter("@prodid", 24));
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command using "FOR XML AUTO"</param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public XmlReader ExecuteXmlReader(IDbConnection connection, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (connection == null) throw new ArgumentNullException("connection");

   bool mustCloseConnection = false;
   // Create a command and prepare it for execution
   IDbCommand cmd = connection.CreateCommand();
   try
   {
    PrepareCommand(cmd, connection, (IDbTransaction) null, commandType, commandText, commandParameters, out mustCloseConnection);
    CleanParameterSyntax(cmd);

    return ExecuteXmlReader(cmd);
   }
   catch (Exception ex)
   {
    if (mustCloseConnection)
     connection.Close();
    // Don't just throw ex. It changes the call stack. But we want the ex around for debugging, so...
    Debug.WriteLine(ex);
    throw;
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// XmlReader r = helper.ExecuteXmlReader(conn, "GetOrders", 24, 36);
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="spName">The name of the stored procedure using "FOR XML AUTO"</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public XmlReader ExecuteXmlReader(IDbConnection connection, string spName, params object[] parameterValues)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    ArrayList tempParameter = new ArrayList();
    foreach (IDataParameter parameter in GetSpParameterSet(connection, spName))
    {
     tempParameter.Add(parameter);
    }
    IDataParameter[] commandParameters = (IDataParameter[]) tempParameter.ToArray(typeof (IDataParameter));

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of IDataParameters
    return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset and takes no parameters) against the provided IDbTransaction.
  /// </summary>
  /// <example>
  /// <code>
  /// XmlReader r = helper.ExecuteXmlReader(tran, CommandType.StoredProcedure, "GetOrders");
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command using "FOR XML AUTO"</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public XmlReader ExecuteXmlReader(IDbTransaction transaction, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of IDataParameters
   return ExecuteXmlReader(transaction, commandType, commandText, (IDataParameter[]) null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the specified IDbTransaction
  /// using the provided parameters.
  /// </summary>
  /// <example>
  /// <code>
  /// XmlReader r = helper.ExecuteXmlReader(tran, CommandType.StoredProcedure, "GetOrders", GetParameter("@prodid", 24));
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command using "FOR XML AUTO"</param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public XmlReader ExecuteXmlReader(IDbTransaction transaction, CommandType commandType, string commandText, params IDataParameter[] commandParameters)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");

// Create the DataAdapter & DataSet
XmlReader retval = ExecuteXmlReader(cmd);

   // Detach the IDataParameters from the command object, so they can be used again
   // don't do this...screws up output params -- cjbreisch
   // cmd.Parameters.Clear();
   return retval;
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified
  /// IDbTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// XmlReader r = helper.ExecuteXmlReader(trans, "GetOrders", 24, 36);
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="spName">The name of the stored procedure using "FOR XML AUTO"</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public XmlReader ExecuteXmlReader(IDbTransaction transaction, string spName, params object[] parameterValues)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    ArrayList tempParameter = new ArrayList();
    foreach (IDataParameter parameter in GetSpParameterSet(transaction.Connection, spName))
    {
     tempParameter.Add(parameter);
    }
    IDataParameter[] commandParameters = (IDataParameter[]) tempParameter.ToArray(typeof (IDataParameter));

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of IDataParameters
    return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
   }
  }

#endregion ExecuteXmlReader

#region ExecuteXmlReaderTypedParams

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will assign the parameter values based on parameter order.
  /// </summary>
  /// <param name="command">The IDbCommand to execute</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  public XmlReader ExecuteXmlReaderTypedParams(IDbCommand command, DataRow dataRow)
  {
   if (command == null) throw new ArgumentNullException("command");

   // If the row has values, the store procedure parameters must be initialized
   if (dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Set the parameters values
    AssignParameterValues(command.Parameters, dataRow);

    return ExecuteXmlReader(command);
   }
   else
   {
    return ExecuteXmlReader(command);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public XmlReader ExecuteXmlReaderTypedParams(IDbConnection connection, String spName, DataRow dataRow)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

   // If the row has values, the store procedure parameters must be initialized
   if (dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    ArrayList tempParameter = new ArrayList();
    foreach (IDataParameter parameter in GetSpParameterSet(connection, spName))
    {
     tempParameter.Add(parameter);
    }
    IDataParameter[] commandParameters = (IDataParameter[]) tempParameter.ToArray(typeof (IDataParameter));

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified IDbTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="transaction">A valid IDbTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public XmlReader ExecuteXmlReaderTypedParams(IDbTransaction transaction, String spName, DataRow dataRow)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

   // If the row has values, the store procedure parameters must be initialized
   if (dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    ArrayList tempParameter = new ArrayList();
    foreach (IDataParameter parameter in GetSpParameterSet(transaction.Connection, spName))
    {
     tempParameter.Add(parameter);
    }
    IDataParameter[] commandParameters = (IDataParameter[]) tempParameter.ToArray(typeof (IDataParameter));

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
   }
  }

#endregion

#region FillDataset

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the database specified in
  /// the connection string.
  /// </summary>
  /// <param name="command">The IDbCommand to execute</param>
  /// <param name="dataSet">A DataSet wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)</param>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  public virtual void FillDataset(IDbCommand command, DataSet dataSet, string[] tableNames)
  {
   bool mustCloseConnection = false;

// Clean Up Parameter Syntax
CleanParameterSyntax(command);

   if (command.Connection.State != ConnectionState.Open)
   {
    command.Connection.Open();
    mustCloseConnection = true;
   }

   // Create the DataAdapter & DataSet
   IDbDataAdapter dataAdapter = null;
   try
   {
    dataAdapter = GetDataAdapter();
    dataAdapter.SelectCommand = command;

    // Add the table mappings specified by the user
    if (tableNames != null && tableNames.Length > 0)
    {
     string tableName = "Table";
     for (int index = 0; index < tableNames.Length; index++)
     {
      if (tableNames[index] == null || tableNames[index].Length == 0)
       throw new ArgumentException("The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames");
      dataAdapter.TableMappings.Add(
       tableName + (index == 0 ? "" : index.ToString()),
       tableNames[index]);
     }
    }

// Fill the DataSet using default values for DataTable names, etc
dataAdapter.Fill(dataSet);

    if (mustCloseConnection)
    {
     command.Connection.Close();
    }

    // Detach the IDataParameters from the command object, so they can be used again
    // don't do this...screws up output params --cjb
    // command.Parameters.Clear();
   }
   finally
   {
    IDisposable id = dataAdapter as IDisposable;
    if (id != null) id.Dispose();
   }

}

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <example>
  /// <code>
  /// helper.FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
  /// </code></example>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="dataSet">A DataSet wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)</param>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  public virtual void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (dataSet == null) throw new ArgumentNullException("dataSet");

   // Create & open an IDbConnection, and dispose of it after we are done
   IDbConnection connection = null;
   try
   {
    connection = GetConnection(connectionString);
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    FillDataset(connection, commandType, commandText, dataSet, tableNames);
   }
   finally
   {
    IDisposable id = connection as IDisposable;
    if (id != null) id.Dispose();
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <param name="dataSet">A DataSet wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  public virtual void FillDataset(string connectionString, CommandType commandType,
                                  string commandText, DataSet dataSet, string[] tableNames,
                                  params IDataParameter[] commandParameters)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (dataSet == null) throw new ArgumentNullException("dataSet");
   // Create & open an IDbConnection, and dispose of it after we are done
   IDbConnection connection = null;
   try
   {
    connection = GetConnection(connectionString);
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
   }
   finally
   {
    IDisposable id = connection as IDisposable;
    if (id != null) id.Dispose();
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the database specified in
  /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// helper.FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
  /// </code></example>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  public virtual void FillDataset(string connectionString, string spName,
                                  DataSet dataSet, string[] tableNames,
                                  params object[] parameterValues)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (dataSet == null) throw new ArgumentNullException("dataSet");

   // Create & open an IDbConnection, and dispose of it after we are done
   IDbConnection connection = null;
   try
   {
    connection = GetConnection(connectionString);
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    FillDataset(connection, spName, dataSet, tableNames, parameterValues);
   }
   finally
   {
    IDisposable id = connection as IDisposable;
    if (id != null) id.Dispose();
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset and takes no parameters) against the provided IDbConnection.
  /// </summary>
  /// <example>
  /// <code>
  /// helper.FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual void FillDataset(IDbConnection connection, CommandType commandType,
                                  string commandText, DataSet dataSet, string[] tableNames)
  {
   FillDataset(connection, commandType, commandText, dataSet, tableNames, null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the provided parameters.
  /// </summary>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="dataSet">A DataSet wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual void FillDataset(IDbConnection connection, CommandType commandType,
                                  string commandText, DataSet dataSet, string[] tableNames,
                                  params IDataParameter[] commandParameters)
  {
   FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// helper.FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
  /// </code></example>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual void FillDataset(IDbConnection connection, string spName,
                                  DataSet dataSet, string[] tableNames,
                                  params object[] parameterValues)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (dataSet == null) throw new ArgumentNullException("dataSet");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discovery
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, iDataParameterValues);
    }
    else
    {
     // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(connection, spName, includeReturnValue);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

     // Call the overload that takes an array of IDataParameters
     FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset and takes no parameters) against the provided IDbTransaction.
  /// </summary>
  /// <example>
  /// <code>
  /// helper.FillDataset(tran, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual void FillDataset(IDbTransaction transaction, CommandType commandType,
                                  string commandText,
                                  DataSet dataSet, string[] tableNames)
  {
   FillDataset(transaction, commandType, commandText, dataSet, tableNames, null);
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the specified IDbTransaction
  /// using the provided parameters.
  /// </summary>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="dataSet">A DataSet wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual void FillDataset(IDbTransaction transaction, CommandType commandType,
                                  string commandText, DataSet dataSet, string[] tableNames,
                                  params IDataParameter[] commandParameters)
  {
   FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified
  /// IDbTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  /// </remarks>
  /// <example>
  /// <code>
  /// helper.FillDataset(tran, "GetOrders", ds, new string[] {"orders"}, 24, 36);
  /// </code></example>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual void FillDataset(IDbTransaction transaction, string spName,
                                  DataSet dataSet, string[] tableNames,
                                  params object[] parameterValues)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
   if (dataSet == null) throw new ArgumentNullException("dataSet");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

    // if we've been passed IDataParameters, don't do parameter discovery
    if (AreParameterValuesIDataParameters(parameterValues, iDataParameterValues))
    {
     FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, iDataParameterValues);
    }
    else
    {
     // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
     bool includeReturnValue = CheckForReturnValueParameter(parameterValues);
     IDataParameter[] commandParameters = GetSpParameterSet(transaction.Connection, spName, includeReturnValue);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

     // Call the overload that takes an array of IDataParameters
     FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
    }
   }
   else
   {
    // Otherwise we can just call the SP without params
    FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
   }
  }

  /// <summary>
  /// Private helper method that execute an IDbCommand (that returns a resultset) against the specified IDbTransaction and IDbConnection
  /// using the provided parameters.
  /// </summary>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="transaction">A valid IDbTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="dataSet">A DataSet wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="commandParameters">An array of IDataParameters used to execute the command</param>
  private void FillDataset(IDbConnection connection, IDbTransaction transaction, CommandType commandType,
                           string commandText, DataSet dataSet, string[] tableNames,
                           params IDataParameter[] commandParameters)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (dataSet == null) throw new ArgumentNullException("dataSet");

   // Create a command and prepare it for execution
   IDbCommand command = connection.CreateCommand();
   bool mustCloseConnection = false;
   PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
   CleanParameterSyntax(command);

FillDataset(command, dataSet, tableNames);

   if (mustCloseConnection)
    connection.Close();
  }

#endregion

#region UpdateDataset

  /// <summary>
  /// This method consumes the RowUpdatingEvent and passes it on to the consumer specifed in the call to UpdateDataset
  /// </summary>
  /// <param name="obj">The object that generated the event</param>
  /// <param name="e">The System.Data.Common.RowUpdatingEventArgs</param>
  protected void RowUpdating(object obj, System.Data.Common.RowUpdatingEventArgs e)
  {
   if (this.m_rowUpdating != null)
    m_rowUpdating(obj, e);
  }

  /// <summary>
  /// This method consumes the RowUpdatedEvent and passes it on to the consumer specifed in the call to UpdateDataset
  /// </summary>
  /// <param name="obj">The object that generated the event</param>
  /// <param name="e">The System.Data.Common.RowUpdatingEventArgs</param>
  protected void RowUpdated(object obj, System.Data.Common.RowUpdatedEventArgs e)
  {
   if (this.m_rowUpdated != null)
    m_rowUpdated(obj, e);
  }

  /// <summary>
  /// Set up a command for updating a DataSet.
  /// </summary>
  /// <param name="command">command object to prepare</param>
  /// <param name="mustCloseConnection">output parameter specifying whether the connection used should be closed by the DAAB</param>
  /// <returns>An IDbCommand object</returns>
  protected virtual IDbCommand SetCommand(IDbCommand command, out bool mustCloseConnection)
  {
   mustCloseConnection = false;
   if (command != null)
   {
    IDataParameter[] commandParameters = new IDataParameter[command.Parameters.Count];
    command.Parameters.CopyTo(commandParameters, 0);
    command.Parameters.Clear();
    this.PrepareCommand(command, command.Connection, null, command.CommandType, command.CommandText, commandParameters, out mustCloseConnection);
    CleanParameterSyntax(command);
   }

return command;
}

  /// <summary>
  /// Executes the respective command for each inserted, updated, or deleted row in the DataSet.
  /// </summary>
  /// <example>
  /// <code>
  /// helper.UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
  /// </code></example>
  /// <param name="insertCommand">A valid SQL statement or stored procedure to insert new records into the data source</param>
  /// <param name="deleteCommand">A valid SQL statement or stored procedure to delete records from the data source</param>
  /// <param name="updateCommand">A valid SQL statement or stored procedure used to update records in the data source</param>
  /// <param name="dataSet">The DataSet used to update the data source</param>
  /// <param name="tableName">The DataTable used to update the data source.</param>
  public virtual void UpdateDataset(IDbCommand insertCommand, IDbCommand deleteCommand, IDbCommand updateCommand, DataSet dataSet, string tableName)
  {
   UpdateDataset(insertCommand, deleteCommand, updateCommand, dataSet, tableName, null, null);
  }

  /// <summary>
  /// Executes the IDbCommand for each inserted, updated, or deleted row in the DataSet also implementing RowUpdating and RowUpdated Event Handlers
  /// </summary>
  /// <example>
  /// <code>
  /// RowUpdatingEventHandler rowUpdatingHandler = new RowUpdatingEventHandler( OnRowUpdating );
  /// RowUpdatedEventHandler rowUpdatedHandler = new RowUpdatedEventHandler( OnRowUpdated );
  /// helper.UpdateDataSet(sqlInsertCommand, sqlDeleteCommand, sqlUpdateCommand, dataSet, "Order", rowUpdatingHandler, rowUpdatedHandler);
  /// </code></example>
  /// <param name="insertCommand">A valid SQL statement or stored procedure to insert new records into the data source</param>
  /// <param name="deleteCommand">A valid SQL statement or stored procedure to delete records from the data source</param>
  /// <param name="updateCommand">A valid SQL statement or stored procedure used to update records in the data source</param>
  /// <param name="dataSet">The DataSet used to update the data source</param>
  /// <param name="tableName">The DataTable used to update the data source.</param>
  /// <param name="rowUpdatingHandler">RowUpdatingEventHandler</param>
  /// <param name="rowUpdatedHandler">RowUpdatedEventHandler</param>
  public void UpdateDataset(IDbCommand insertCommand, IDbCommand deleteCommand, IDbCommand updateCommand,
                            DataSet dataSet, string tableName, RowUpdatingHandler rowUpdatingHandler, RowUpdatedHandler rowUpdatedHandler)
  {
   int rowsAffected = 0;

if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName");

   // Create an IDbDataAdapter, and dispose of it after we are done
   IDbDataAdapter dataAdapter = null;
   try
   {
    bool mustCloseUpdateConnection = false;
    bool mustCloseInsertConnection = false;
    bool mustCloseDeleteConnection = false;

dataAdapter = GetDataAdapter();

    // Set the data adapter commands
    dataAdapter.UpdateCommand = SetCommand(updateCommand, out mustCloseUpdateConnection);
    dataAdapter.InsertCommand = SetCommand(insertCommand, out mustCloseInsertConnection);
    dataAdapter.DeleteCommand = SetCommand(deleteCommand, out mustCloseDeleteConnection);

AddUpdateEventHandlers(dataAdapter, rowUpdatingHandler, rowUpdatedHandler);

    if (dataAdapter is DbDataAdapter)
    {
     // Update the DataSet changes in the data source
     try
     {
      rowsAffected = ((DbDataAdapter) dataAdapter).Update(dataSet, tableName);
     }
     catch (Exception ex)
     {
      // Don't just throw ex. It changes the call stack. But we want the ex around for debugging, so...
      Debug.WriteLine(ex);
      throw;
     }
    }
    else
    {
     dataAdapter.TableMappings.Add(tableName, "Table");

     // Update the DataSet changes in the data source
     rowsAffected = dataAdapter.Update(dataSet);
    }

// Commit all the changes made to the DataSet
dataSet.Tables[tableName].AcceptChanges();

    if (mustCloseUpdateConnection)
    {
     updateCommand.Connection.Close();
    }
    if (mustCloseInsertConnection)
    {
     insertCommand.Connection.Close();
    }
    if (mustCloseDeleteConnection)
    {
     deleteCommand.Connection.Close();
    }
   }
   finally
   {
    IDisposable id = dataAdapter as IDisposable;
    if (id != null) id.Dispose();
   }
  }

#endregion

#region CreateCommand

  /// <summary>
  /// Simplify the creation of an IDbCommand object by allowing
  /// a stored procedure and optional parameters to be provided
  /// </summary>
  /// <example>
  /// <code>
  /// IDbCommand command = helper.CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
  /// </code></example>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>
  /// <returns>A valid IDbCommand object</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.InvalidOperationException">Thrown if any of the IDataParameters.ParameterNames are null, or if the parameter count does not match the number of values supplied</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentException">Thrown if the parameter count does not match the number of values supplied</exception>
  public virtual IDbCommand CreateCommand(string connectionString, string spName, params string[] sourceColumns)
  {
   return CreateCommand(this.GetConnection(connectionString), spName, sourceColumns);
  }

  /// <summary>
  /// Simplify the creation of an IDbCommand object by allowing
  /// a stored procedure and optional parameters to be provided
  /// </summary>
  /// <example>
  /// <code>
  /// IDbCommand command = helper.CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
  /// </code></example>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>
  /// <returns>A valid IDbCommand object</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual IDbCommand CreateCommand(IDbConnection connection, string spName, params string[] sourceColumns)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

   // Create an IDbCommand
   IDbCommand cmd = connection.CreateCommand();
   cmd.CommandText = spName;
   cmd.CommandType = CommandType.StoredProcedure;

   // If we receive parameter values, we need to figure out where they go
   if ((sourceColumns != null) && (sourceColumns.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    IDataParameter[] commandParameters = GetSpParameterSet(connection, spName);

    // Assign the provided source columns to these parameters based on parameter order
    for (int index = 0; index < sourceColumns.Length; index++)
     if (commandParameters[index].SourceColumn == String.Empty)
      commandParameters[index].SourceColumn = sourceColumns[index];

    // Attach the discovered parameters to the IDbCommand object
    AttachParameters(cmd, commandParameters);
   }

return cmd;
}

  /// <summary>
  /// Simplify the creation of an IDbCommand object by allowing
  /// a stored procedure and optional parameters to be provided
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandText">A valid SQL statement</param>
  /// <param name="commandType">A System.Data.CommandType</param>
  /// <param name="commandParameters">The parameters for the SQL statement</param>
  /// <returns>A valid IDbCommand object</returns>
  public virtual IDbCommand CreateCommand(string connectionString, string commandText, CommandType commandType, params IDataParameter[] commandParameters)
  {
   return CreateCommand(this.GetConnection(connectionString), commandText, commandType, commandParameters);
  }

  /// <summary>
  /// Simplify the creation of an IDbCommand object by allowing
  /// a stored procedure and optional parameters to be provided
  /// </summary>
  /// <example><code>
  /// IDbCommand command = helper.CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
  /// </code></example>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="commandText">A valid SQL statement</param>
  /// <param name="commandType">A System.Data.CommandType</param>
  /// <param name="commandParameters">The parameters for the SQL statement</param>
  /// <returns>A valid IDbCommand object</returns>
  public virtual IDbCommand CreateCommand(IDbConnection connection, string commandText, CommandType commandType, params IDataParameter[] commandParameters)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

   // Create an IDbCommand
   IDbCommand cmd = connection.CreateCommand();
   cmd.CommandText = commandText;
   cmd.CommandType = commandType;

   // If we receive parameter values, we need to figure out where they go
   if ((commandParameters != null) && (commandParameters.Length > 0))
   {
    // Assign the provided source columns to these parameters based on parameter order
    for (int index = 0; index < commandParameters.Length; index++)
     commandParameters[index].SourceColumn = commandParameters[index].ParameterName.TrimStart(new char[] {'@'});

    // Attach the discovered parameters to the IDbCommand object
    AttachParameters(cmd, commandParameters);
   }

return cmd;
}

#endregion

#region ExecuteNonQueryTypedParams

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns no resultset)
  /// against the database specified in the connection string using the
  /// dataRow column values as the stored procedure's parameters values.
  /// This method will assign the parameter values based on row values.
  /// </summary>
  /// <param name="command">The IDbCommand to execute</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  public virtual int ExecuteNonQueryTypedParams(IDbCommand command, DataRow dataRow)
  {
   int retVal = 0;

// Clean Up Parameter Syntax
CleanParameterSyntax(command);

    retVal = ExecuteNonQuery(command);
   }
   else
   {
    retVal = ExecuteNonQuery(command);
   }

return retVal;
}

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns no resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  public virtual int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns no resultset) against the specified IDbConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual int ExecuteNonQueryTypedParams(IDbConnection connection, String spName, DataRow dataRow)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns no resultset) against the specified
  /// IDbTransaction using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="transaction">A valid IDbTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual int ExecuteNonQueryTypedParams(IDbTransaction transaction, String spName, DataRow dataRow)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

   // Sf the row has values, the store procedure parameters must be initialized
   if (dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    IDataParameter[] commandParameters = GetSpParameterSet(transaction.Connection, spName);

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
   }
  }

#endregion

#region ExecuteDatasetTypedParams

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will assign the paraemter values based on row values.
  /// </summary>
  /// <param name="command">The IDbCommand to execute</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if command is null.</exception>
  public virtual DataSet ExecuteDatasetTypedParams(IDbCommand command, DataRow dataRow)
  {
   DataSet ds = null;

// Clean Up Parameter Syntax
CleanParameterSyntax(command);

    ds = ExecuteDataset(command);
   }
   else
   {
    ds = ExecuteDataset(command);
   }

return ds;
}

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  public virtual DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the dataRow column values as the store procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual DataSet ExecuteDatasetTypedParams(IDbConnection connection, String spName, DataRow dataRow)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified IDbTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="transaction">A valid IDbTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A DataSet containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual DataSet ExecuteDatasetTypedParams(IDbTransaction transaction, String spName, DataRow dataRow)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
   }
  }

#endregion

#region ExecuteReaderTypedParams

// Clean Up Parameter Syntax
CleanParameterSyntax(command);

    reader = ExecuteReader(command);
   }
   else
   {
    reader = ExecuteReader(command);
   }

return reader;
}

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  public virtual IDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified IDbConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual IDataReader ExecuteReaderTypedParams(IDbConnection connection, String spName, DataRow dataRow)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteReader(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a resultset) against the specified IDbTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="transaction">A valid IDbTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A IDataReader containing the resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual IDataReader ExecuteReaderTypedParams(IDbTransaction transaction, String spName, DataRow dataRow)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
   }
  }

#endregion

#region ExecuteScalarTypedParams

// Clean Up Parameter Syntax
CleanParameterSyntax(command);

    retVal = ExecuteScalar(command);
   }
   else
   {
    retVal = ExecuteScalar(command);
   }

return retVal;
}

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a 1x1 resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  public virtual object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a 1x1 resultset) against the specified IDbConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual object ExecuteScalarTypedParams(IDbConnection connection, String spName, DataRow dataRow)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via an IDbCommand (that returns a 1x1 resultset) against the specified IDbTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="transaction">A valid IDbTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if transaction.Connection is null</exception>
  public virtual object ExecuteScalarTypedParams(IDbTransaction transaction, String spName, DataRow dataRow)
  {
   if (transaction == null) throw new ArgumentNullException("transaction");
   if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or commited, please provide an open transaction.", "transaction");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// Set the parameters values
AssignParameterValues(commandParameters, dataRow);

    return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
   }
  }

#endregion

#region Parameter Discovery Functions

  /// <summary>
  /// Checks for the existence of a return value parameter in the parametervalues
  /// </summary>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>true if the parameterValues contains a return value parameter, false otherwise</returns>
  private bool CheckForReturnValueParameter(object[] parameterValues)
  {
   bool hasReturnValue = false;
   foreach (object paramObject in parameterValues)
   {
    if (paramObject is IDataParameter)
    {
     IDataParameter paramInstance = (IDataParameter) paramObject;
     if (paramInstance.Direction == ParameterDirection.ReturnValue)
     {
      hasReturnValue = true;
      break;
     }
    }
   }
   return hasReturnValue;
  }

  /// <summary>
  /// Check to see if the parameter values passed to the helper are, in fact, IDataParameters.
  /// </summary>
  /// <param name="parameterValues">Array of parameter values passed to helper</param>
  /// <param name="iDataParameterValues">new array of IDataParameters built from parameter values</param>
  /// <returns>True if the parameter values are IDataParameters</returns>
  private bool AreParameterValuesIDataParameters(object[] parameterValues, IDataParameter[] iDataParameterValues)
  {
   bool areIDataParameters = true;

   for (int i = 0; i < parameterValues.Length; i++)
   {
    if (!(parameterValues[i] is IDataParameter))
    {
     areIDataParameters = false;
     break;
    }
    iDataParameterValues[i] = (IDataParameter) parameterValues[i];
   }
   return areIDataParameters;
  }

  /// <summary>
  /// Retrieves the set of IDataParameters appropriate for the stored procedure
  /// </summary>
  /// <remarks>
  /// This method will query the database for this information, and then store it in a cache for future requests.
  /// </remarks>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <returns>An array of IDataParameterParameters</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  public virtual IDataParameter[] GetSpParameterSet(string connectionString, string spName)
  {
   return GetSpParameterSet(connectionString, spName, false);
  }

  /// <summary>
  /// Retrieves the set of IDataParameters appropriate for the stored procedure
  /// </summary>
  /// <remarks>
  /// This method will query the database for this information, and then store it in a cache for future requests.
  /// </remarks>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
  /// <returns>An array of IDataParameters</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  public virtual IDataParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

   using (IDbConnection connection = GetConnection(connectionString))
   {
    return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
   }
  }

  /// <summary>
  /// Retrieves the set of IDataParameters appropriate for the stored procedure
  /// </summary>
  /// <remarks>
  /// This method will query the database for this information, and then store it in a cache for future requests.
  /// </remarks>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
  /// <returns>An array of IDataParameters</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public virtual IDataParameter[] GetSpParameterSet(IDbConnection connection, string spName, bool includeReturnValueParameter)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (connection as ICloneable == null) throw new ArgumentException("can磘 discover parameters if the connection doesn磘 implement the ICloneable interface", "connection");

   IDbConnection clonedConnection = (IDbConnection) ((ICloneable) connection).Clone();
   return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
  }

  /// <summary>
  /// Retrieves the set of IDataParameters appropriate for the stored procedure
  /// </summary>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
  /// <returns>An array of IDataParameters</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  private IDataParameter[] GetSpParameterSetInternal(IDbConnection connection, string spName, bool includeReturnValueParameter)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

// string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter":"");

IDataParameter[] cachedParameters;

cachedParameters = GetCachedParameterSet(connection,
spName + (includeReturnValueParameter ? ":include ReturnValue Parameter" : ""));

   if (cachedParameters == null)
   {
    IDataParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
    CacheParameterSet(connection,
                      spName + (includeReturnValueParameter ? ":include ReturnValue Parameter" : ""), spParameters);

cachedParameters = ADOHelperParameterCache.CloneParameters(spParameters);
}

return cachedParameters;
}

  /// <summary>
  /// Retrieve a parameter array from the cache
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>An array of IDataParameters</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  public IDataParameter[] GetCachedParameterSet(string connectionString, string commandText)
  {
   using (IDbConnection connection = GetConnection(connectionString))
   {
    return GetCachedParameterSetInternal(connection, commandText);
   }
  }

  /// <summary>
  /// Retrieve a parameter array from the cache
  /// </summary>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>An array of IDataParameters</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public IDataParameter[] GetCachedParameterSet(IDbConnection connection, string commandText)
  {
   return GetCachedParameterSetInternal(connection, commandText);
  }

  /// <summary>
  /// Retrieve a parameter array from the cache
  /// </summary>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>An array of IDataParameters</returns>
  private IDataParameter[] GetCachedParameterSetInternal(IDbConnection connection, string commandText)
  {
   bool mustCloseConnection = false;
   // this way we control the connection, and therefore the connection string that gets saved as a hash key
   if (connection.State != ConnectionState.Open)
   {
    connection.Open();
    mustCloseConnection = true;
   }

IDataParameter[] parameters = ADOHelperParameterCache.GetCachedParameterSet(connection.ConnectionString, commandText);

   if (mustCloseConnection)
   {
    connection.Close();
   }

return parameters;
}

  /// <summary>
  /// Add parameter array to the cache
  /// </summary>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters to be cached</param>
  public void CacheParameterSet(IDbConnection connection, string commandText, params IDataParameter[] commandParameters)
  {
   if (connection is ICloneable)
   {
    using (IDbConnection clonedConnection = (IDbConnection) ((ICloneable) connection).Clone())
    {
     CacheParameterSetInternal(clonedConnection, commandText, commandParameters);
    }
   }
   else
   {
    throw new InvalidCastException();
   }
  }

  /// <summary>
  /// Add parameter array to the cache
  /// </summary>
  /// <param name="connection">A valid IDbConnection</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters to be cached</param>
  private void CacheParameterSetInternal(IDbConnection connection, string commandText, params IDataParameter[] commandParameters)
  {
   // this way we control the connection, and therefore the connection string that gets saved as a hask key
   connection.Open();
   ADOHelperParameterCache.CacheParameterSet(connection.ConnectionString, commandText, commandParameters);
   connection.Close();
  }

  /// <summary>
  /// Resolve at run time the appropriate set of IDataParameters for a stored procedure
  /// </summary>
  /// <param name="connection">A valid IDbConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="includeReturnValueParameter">Whether or not to include their return value parameter</param>
  /// <returns>The parameter array discovered.</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  private IDataParameter[] DiscoverSpParameterSet(IDbConnection connection, string spName, bool includeReturnValueParameter)
  {
   if (connection == null) throw new ArgumentNullException("connection");
   if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

   IDbCommand cmd = connection.CreateCommand();
   cmd.CommandText = spName;
   cmd.CommandType = CommandType.StoredProcedure;

   connection.Open();
   DeriveParameters(cmd);
   connection.Close();

   if (!includeReturnValueParameter)
   {
    // not all providers have return value parameters...don't just remove this parameter indiscriminately
    if (cmd.Parameters.Count > 0 && ((IDataParameter) cmd.Parameters[0]).Direction == ParameterDirection.ReturnValue)
    {
     cmd.Parameters.RemoveAt(0);
    }
   }

IDataParameter[] discoveredParameters = new IDataParameter[cmd.Parameters.Count];

cmd.Parameters.CopyTo(discoveredParameters, 0);

   // Init the parameters with a DBNull value
   foreach (IDataParameter discoveredParameter in discoveredParameters)
   {
    discoveredParameter.Value = DBNull.Value;
   }
   return discoveredParameters;
  }

#endregion Parameter Discovery Functions
}

#region ParameterCache

/// <summary>
/// ADOHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the
/// ability to discover parameters for stored procedures at run-time.
/// </summary>
public sealed class ADOHelperParameterCache
{
private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());

  /// <summary>
  /// Deep copy of cached IDataParameter array
  /// </summary>
  /// <param name="originalParameters"></param>
  /// <returns></returns>
  internal static IDataParameter[] CloneParameters(IDataParameter[] originalParameters)
  {
   IDataParameter[] clonedParameters = new IDataParameter[originalParameters.Length];

   for (int i = 0, j = originalParameters.Length; i < j; i++)
   {
    clonedParameters[i] = (IDataParameter) ((ICloneable) originalParameters[i]).Clone();
   }

return clonedParameters;
}

#region caching functions

  /// <summary>
  /// Add parameter array to the cache
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <param name="commandParameters">An array of IDataParameters to be cached</param>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  internal static void CacheParameterSet(string connectionString, string commandText, params IDataParameter[] commandParameters)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

string hashKey = connectionString + ":" + commandText;

paramCache[hashKey] = commandParameters;
}

  /// <summary>
  /// Retrieve a parameter array from the cache
  /// </summary>
  /// <param name="connectionString">A valid connection string for an IDbConnection</param>
  /// <param name="commandText">The stored procedure name or SQL command</param>
  /// <returns>An array of IDataParameters</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if commandText is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connectionString is null</exception>
  internal static IDataParameter[] GetCachedParameterSet(string connectionString, string commandText)
  {
   if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
   if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

string hashKey = connectionString + ":" + commandText;

   IDataParameter[] cachedParameters = paramCache[hashKey] as IDataParameter[];
   if (cachedParameters == null)
   {
    return null;
   }
   else
   {
    return CloneParameters(cachedParameters);
   }
  }

#endregion caching functions
}

#endregion

public class DAABSectionHandler :
IConfigurationSectionHandler
{
#region IConfigurationSectionHandler Members

  /// <summary>
  /// Evaluates the given XML section and returns a Hashtable that contains the results of the evaluation.
  /// </summary>
  /// <param name="parent">The configuration settings in a corresponding parent configuration section. </param>
  /// <param name="configContext">An HttpConfigurationContext when Create is called from the ASP.NET configuration system. Otherwise, this parameter is reserved and is a null reference (Nothing in Visual Basic). </param>
  /// <param name="section">The XmlNode that contains the configuration information to be handled. Provides direct access to the XML contents of the configuration section. </param>
  /// <returns>A Hashtable that contains the section's configuration settings.</returns>
  public object Create(object parent, object configContext, XmlNode section)
  {
   Hashtable ht = new Hashtable();
   XmlNodeList list = section.SelectNodes("daabProvider");
   foreach (XmlNode prov in list)
   {
    if (prov.Attributes["alias"] == null)
     throw new InvalidOperationException("The 'daabProvider' node must contain an attribute named 'alias' with the alias name for the provider.");
    if (prov.Attributes["assembly"] == null)
     throw new InvalidOperationException("The 'daabProvider' node must contain an attribute named 'assembly' with the name of the assembly containing the provider.");
    if (prov.Attributes["type"] == null)
     throw new InvalidOperationException("The 'daabProvider' node must contain an attribute named 'type' with the full name of the type for the provider.");

    ht[prov.Attributes["alias"].Value] = new ProviderAlias(prov.Attributes["assembly"].Value, prov.Attributes["type"].Value);
   }
   return ht;
  }

#endregion
}

/// <summary>
/// This class is for reading the 'ProviderAlias' tag from the 'daabProviders' section of the App.Config file
/// </summary>
public class ProviderAlias
{
#region Member variables

private string _assemblyName;
private string _typeName;

#endregion

#region Constructor

  /// <summary>
  /// Constructor required by IConfigurationSectionHandler
  /// </summary>
  /// <param name="assemblyName">The Assembly where this provider can be found</param>
  /// <param name="typeName">The type of the provider</param>
  public ProviderAlias(string assemblyName, string typeName)
  {
   _assemblyName = assemblyName;
   _typeName = typeName;
  }

#endregion

#region Properties

  /// <summary>
  /// Returns the Assembly name for this provider
  /// </summary>
  /// <value>The Assembly name for the specified provider</value>
  public string AssemblyName
  {
   get { return _assemblyName; }
  }

  /// <summary>
  /// Returns the type name of this provider
  /// </summary>
  /// <value>The type name of the specified provider</value>
  public string TypeName
  {
   get { return _typeName; }
  }

#endregion
}

/// <summary>
/// The SqlServer class is intended to encapsulate high performance, scalable best practices for
/// common uses of the SqlClient ADO.NET provider. It is created using the abstract factory in AdoHelper.
/// </summary>
public class SqlServer : AdoHelper
{
  /// <summary>
  /// Create a SQL Helper. Needs to be a default constructor so that the Factory can create it
  /// </summary>
  public SqlServer()
  {
  }

#region Overrides

  /// <summary>
  /// Returns an array of SqlParameters of the specified size
  /// </summary>
  /// <param name="size">size of the array</param>
  /// <returns>The array of SqlParameters</returns>
  protected override IDataParameter[] GetDataParameters(int size)
  {
   return new SqlParameter[size];
  }

  /// <summary>
  /// Returns a SqlConnection object for the given connection string
  /// </summary>
  /// <param name="connectionString">The connection string to be used to create the connection</param>
  /// <returns>A SqlConnection object</returns>
  public override IDbConnection GetConnection(string connectionString)
  {
   return new SqlConnection(connectionString);
  }

  /// <summary>
  /// Returns a SqlDataAdapter object
  /// </summary>
  /// <returns>The SqlDataAdapter</returns>
  public override IDbDataAdapter GetDataAdapter()
  {
   return new SqlDataAdapter();
  }

if (!(cmd is SqlCommand))
throw new ArgumentException("The command provided is not a SqlCommand instance.", "cmd");

   if (cmd.Connection.State != ConnectionState.Open)
   {
    cmd.Connection.Open();
    mustCloseConnection = true;
   }

SqlDeriveParameters.DeriveParameters((SqlCommand) cmd);

   if (mustCloseConnection)
   {
    cmd.Connection.Close();
   }
  }

  /// <summary>
  /// Returns a SqlParameter object
  /// </summary>
  /// <returns>The SqlParameter object</returns>
  public override IDataParameter GetParameter()
  {
   return new SqlParameter();
  }

  /// <summary>
  /// Detach the IDataParameters from the command object, so they can be used again.
  /// </summary>
  /// <param name="command">command object to clear</param>
  protected override void ClearCommand(IDbCommand command)
  {
   // HACK: There is a problem here, the output parameter values are fletched
   // when the reader is closed, so if the parameters are detached from the command
   // then the IDataReader can磘 set its values.
   // When this happen, the parameters can磘 be used again in other command.
   bool canClear = true;

   foreach (IDataParameter commandParameter in command.Parameters)
   {
    if (commandParameter.Direction != ParameterDirection.Input)
     canClear = false;

   }
   if (canClear)
   {
    command.Parameters.Clear();
   }
  }

  /// <summary>
  /// This cleans up the parameter syntax for an SQL Server call. This was split out from PrepareCommand so that it could be called independently.
  /// </summary>
  /// <param name="command">An IDbCommand object containing the CommandText to clean.</param>
  public override void CleanParameterSyntax(IDbCommand command)
  {
   // do nothing for SQL
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the provided SqlConnection.
  /// </summary>
  /// <example>
  /// <code>
  /// XmlReader r = helper.ExecuteXmlReader(command);
  /// </code></example>
  /// <param name="command">The IDbCommand to execute</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public override XmlReader ExecuteXmlReader(IDbCommand command)
  {
   bool mustCloseConnection = false;

   if (command.Connection.State != ConnectionState.Open)
   {
    command.Connection.Open();
    mustCloseConnection = true;
   }

   CleanParameterSyntax(command);
   // Create the DataAdapter & DataSet
   XmlReader retval = ((SqlCommand) command).ExecuteXmlReader();

   // Detach the SqlParameters from the command object, so they can be used again
   // don't do this...screws up output parameters -- cjbreisch
   // cmd.Parameters.Clear();

   if (mustCloseConnection)
   {
    command.Connection.Close();
   }

return retval;
}

  /// <summary>
  /// Provider specific code to set up the updating/ed event handlers used by UpdateDataset
  /// </summary>
  /// <param name="dataAdapter">DataAdapter to attach the event handlers to</param>
  /// <param name="rowUpdatingHandler">The handler to be called when a row is updating</param>
  /// <param name="rowUpdatedHandler">The handler to be called when a row is updated</param>
  protected override void AddUpdateEventHandlers(IDbDataAdapter dataAdapter, RowUpdatingHandler rowUpdatingHandler, RowUpdatedHandler rowUpdatedHandler)
  {
   if (rowUpdatingHandler != null)
   {
    this.m_rowUpdating = rowUpdatingHandler;
    ((SqlDataAdapter) dataAdapter).RowUpdating += new SqlRowUpdatingEventHandler(RowUpdating);
   }

   if (rowUpdatedHandler != null)
   {
    this.m_rowUpdated = rowUpdatedHandler;
    ((SqlDataAdapter) dataAdapter).RowUpdated += new SqlRowUpdatedEventHandler(RowUpdated);
   }
  }

  /// <summary>
  /// Handles the RowUpdating event
  /// </summary>
  /// <param name="obj">The object that published the event</param>
  /// <param name="e">The SqlRowUpdatingEventArgs</param>
  protected void RowUpdating(object obj, SqlRowUpdatingEventArgs e)
  {
   base.RowUpdating(obj, e);
  }

  /// <summary>
  /// Handles the RowUpdated event
  /// </summary>
  /// <param name="obj">The object that published the event</param>
  /// <param name="e">The SqlRowUpdatedEventArgs</param>
  protected void RowUpdated(object obj, SqlRowUpdatedEventArgs e)
  {
   base.RowUpdated(obj, e);
  }

  /// <summary>
  /// Handle any provider-specific issues with BLOBs here by "washing" the IDataParameter and returning a new one that is set up appropriately for the provider.
  /// </summary>
  /// <param name="connection">The IDbConnection to use in cleansing the parameter</param>
  /// <param name="p">The parameter before cleansing</param>
  /// <returns>The parameter after it's been cleansed.</returns>
  protected override IDataParameter GetBlobParameter(IDbConnection connection, IDataParameter p)
  {
   // do nothing special for BLOBs...as far as we know now.
   return p;
  }

#endregion
}

#region Derive Parameters

// We create our own class to do this because the existing ADO.NET 1.1 implementation is broken.
internal class SqlDeriveParameters
{
  internal static void DeriveParameters(SqlCommand cmd)
  {
   string cmdText;
   SqlCommand newCommand;
   SqlDataReader reader;
   ArrayList parameterList;
   SqlParameter sqlParam;
   CommandType cmdType;
   string procedureSchema;
   string procedureName;
   int groupNumber;
   SqlTransaction trnSql = cmd.Transaction;

cmdType = cmd.CommandType;

   if ((cmdType == CommandType.Text))
   {
    throw new InvalidOperationException();
   }
   else if ((cmdType == CommandType.TableDirect))
   {
    throw new InvalidOperationException();
   }
   else if ((cmdType != CommandType.StoredProcedure))
   {
    throw new InvalidOperationException();
   }

   procedureName = cmd.CommandText;
   string server = null;
   string database = null;
   procedureSchema = null;

// split out the procedure name to get the server, database, etc.
GetProcedureTokens(ref procedureName, ref server, ref database, ref procedureSchema);

// look for group numbers
groupNumber = ParseGroupNumber(ref procedureName);

newCommand = null;

   // set up the command string. We use sp_procuedure_params_rowset to get the parameters
   if (database != null)
   {
    cmdText = string.Concat("[", database, "]..sp_procedure_params_rowset");
    if (server != null)
    {
     cmdText = string.Concat(server, ".", cmdText);
    }

    // be careful of transactions
    if (trnSql != null)
    {
     newCommand = new SqlCommand(cmdText, cmd.Connection, trnSql);
    }
    else
    {
     newCommand = new SqlCommand(cmdText, cmd.Connection);
    }
   }
   else
   {
    // be careful of transactions
    if (trnSql != null)
    {
     newCommand = new SqlCommand("sp_procedure_params_rowset", cmd.Connection, trnSql);
    }
    else
    {
     newCommand = new SqlCommand("sp_procedure_params_rowset", cmd.Connection);
    }
   }

   newCommand.CommandType = CommandType.StoredProcedure;
   newCommand.Parameters.Add(new SqlParameter("@procedure_name", SqlDbType.NVarChar, 255));
   newCommand.Parameters[0].Value = procedureName;

   // make sure we specify
   if (! IsEmptyString(procedureSchema))
   {
    newCommand.Parameters.Add(new SqlParameter("@procedure_schema", SqlDbType.NVarChar, 255));
    newCommand.Parameters[1].Value = procedureSchema;
   }

   // make sure we specify the groupNumber if we were given one
   if (groupNumber != 0)
   {
    newCommand.Parameters.Add(new SqlParameter("@group_number", groupNumber));
   }

reader = null;
parameterList = new ArrayList();

   try
   {
    // get a reader full of our params
    reader = newCommand.ExecuteReader();
    sqlParam = null;

    while (reader.Read())
    {
     // get all the parameter properties that we can get, Name, type, length, direction, precision
     sqlParam = new SqlParameter();
     sqlParam.ParameterName = (string) (reader["PARAMETER_NAME"]);
     sqlParam.SqlDbType = GetSqlDbType((short) (reader["DATA_TYPE"]), (string) (reader["TYPE_NAME"]));

     if (reader["CHARACTER_MAXIMUM_LENGTH"] != DBNull.Value)
     {
      sqlParam.Size = (int) (reader["CHARACTER_MAXIMUM_LENGTH"]);
     }

sqlParam.Direction = GetParameterDirection((short) (reader["PARAMETER_TYPE"]));

     if ((sqlParam.SqlDbType == SqlDbType.Decimal))
     {
      sqlParam.Scale = (byte) (((short) (reader["NUMERIC_SCALE"]) & 255));
      sqlParam.Precision = (byte) (((short) (reader["NUMERIC_PRECISION"]) & 255));
     }
     parameterList.Add(sqlParam);
    }
   }
   finally
   {
    // close our reader and connection when we're done
    if (reader != null)
    {
     reader.Close();
    }
    newCommand.Connection = null;
   }

   // we didn't get any parameters
   if ((parameterList.Count == 0))
   {
    throw new InvalidOperationException();
   }

cmd.Parameters.Clear();

// add the parameters to the command object

   foreach (object parameter in parameterList)
   {
    cmd.Parameters.Add(parameter);
   }
  }

  /// <summary>
  /// Checks to see if the stored procedure being called is part of a group, then gets the group number if necessary
  /// </summary>
  /// <param name="procedure">Stored procedure being called. This method may change this parameter by removing the group number if it exists.</param>
  /// <returns>the group number</returns>
  private static int ParseGroupNumber(ref string procedure)
  {
   string newProcName;
   int groupPos = procedure.IndexOf(';');
   int groupIndex = 0;

   if (groupPos > 0)
   {
    newProcName = procedure.Substring(0, groupPos);
    try
    {
     groupIndex = int.Parse(procedure.Substring(groupPos + 1));
    }
    catch
    {
     throw new InvalidOperationException();
    }
   }
   else
   {
    newProcName = procedure;
    groupIndex = 0;
   }

   procedure = newProcName;
   return groupIndex;
  }

  /// <summary>
  /// Tokenize the procedure string
  /// </summary>
  /// <param name="procedure">The procedure name</param>
  /// <param name="server">The server name</param>
  /// <param name="database">The database name</param>
  /// <param name="owner">The owner name</param>
  private static void GetProcedureTokens(ref string procedure, ref string server, ref string database, ref string owner)
  {
   string[] spNameTokens;
   int arrIndex;
   int nextPos;
   int currPos;
   int tokenCount;

   server = null;
   database = null;
   owner = null;

spNameTokens = new string[4];

   if (! IsEmptyString(procedure))
   {
    arrIndex = 0;
    nextPos = 0;
    currPos = 0;

    while ((arrIndex < 4))
    {
     currPos = procedure.IndexOf('.', nextPos);
     if ((-1 == currPos))
     {
      spNameTokens[arrIndex] = procedure.Substring(nextPos);
      break;
     }
     spNameTokens[arrIndex] = procedure.Substring(nextPos, (currPos - nextPos));
     nextPos = (currPos + 1);
     if ((procedure.Length <= nextPos))
     {
      break;
     }
     arrIndex = (arrIndex + 1);
    }

tokenCount = arrIndex + 1;

    // based on how many '.' we found, we know what tokens we found
    switch (tokenCount)
    {
     case 1:
      procedure = spNameTokens[0];
      break;
     case 2:
      procedure = spNameTokens[1];
      owner = spNameTokens[0];
      break;
     case 3:
      procedure = spNameTokens[2];
      owner = spNameTokens[1];
      database = spNameTokens[0];
      break;
     case 4:
      procedure = spNameTokens[3];
      owner = spNameTokens[2];
      database = spNameTokens[1];
      server = spNameTokens[0];
      break;
    }
   }
  }

  /// <summary>
  /// Checks for an empty string
  /// </summary>
  /// <param name="str">String to check</param>
  /// <returns>boolean value indicating whether string is empty</returns>
  private static bool IsEmptyString(string str)
  {
   if (str != null)
   {
    return (0 == str.Length);
   }
   return true;
  }

  /// <summary>
  /// Convert OleDbType to SQlDbType
  /// </summary>
  /// <param name="paramType">The OleDbType to convert</param>
  /// <param name="typeName">The typeName to convert for items such as Money and SmallMoney which both map to OleDbType.Currency</param>
  /// <returns>The converted SqlDbType</returns>
  private static SqlDbType GetSqlDbType(short paramType, string typeName)
  {
   SqlDbType cmdType;
   OleDbType oleDbType;
   cmdType = SqlDbType.Variant;
   oleDbType = (OleDbType) (paramType);

   switch (oleDbType)
   {
    case OleDbType.SmallInt:
     cmdType = SqlDbType.SmallInt;
     break;
    case OleDbType.Integer:
     cmdType = SqlDbType.Int;
     break;
    case OleDbType.Single:
     cmdType = SqlDbType.Real;
     break;
    case OleDbType.Double:
     cmdType = SqlDbType.Float;
     break;
    case OleDbType.Currency:
     cmdType = (typeName == "money") ? SqlDbType.Money : SqlDbType.SmallMoney;
     break;
    case OleDbType.Date:
     cmdType = (typeName == "datetime") ? SqlDbType.DateTime : SqlDbType.SmallDateTime;
     break;
    case OleDbType.BSTR:
     cmdType = (typeName == "nchar") ? SqlDbType.NChar : SqlDbType.NVarChar;
     break;
    case OleDbType.Boolean:
     cmdType = SqlDbType.Bit;
     break;
    case OleDbType.Variant:
     cmdType = SqlDbType.Variant;
     break;
    case OleDbType.Decimal:
     cmdType = SqlDbType.Decimal;
     break;
    case OleDbType.TinyInt:
     cmdType = SqlDbType.TinyInt;
     break;
    case OleDbType.UnsignedTinyInt:
     cmdType = SqlDbType.TinyInt;
     break;
    case OleDbType.UnsignedSmallInt:
     cmdType = SqlDbType.SmallInt;
     break;
    case OleDbType.BigInt:
     cmdType = SqlDbType.BigInt;
     break;
    case OleDbType.Filetime:
     cmdType = (typeName == "datetime") ? SqlDbType.DateTime : SqlDbType.SmallDateTime;
     break;
    case OleDbType.Guid:
     cmdType = SqlDbType.UniqueIdentifier;
     break;
    case OleDbType.Binary:
     cmdType = (typeName == "binary") ? SqlDbType.Binary : SqlDbType.VarBinary;
     break;
    case OleDbType.Char:
     cmdType = (typeName == "char") ? SqlDbType.Char : SqlDbType.VarChar;
     break;
    case OleDbType.WChar:
     cmdType = (typeName == "nchar") ? SqlDbType.NChar : SqlDbType.NVarChar;
     break;
    case OleDbType.Numeric:
     cmdType = SqlDbType.Decimal;
     break;
    case OleDbType.DBDate:
     cmdType = (typeName == "datetime") ? SqlDbType.DateTime : SqlDbType.SmallDateTime;
     break;
    case OleDbType.DBTime:
     cmdType = (typeName == "datetime") ? SqlDbType.DateTime : SqlDbType.SmallDateTime;
     break;
    case OleDbType.DBTimeStamp:
     cmdType = (typeName == "datetime") ? SqlDbType.DateTime : SqlDbType.SmallDateTime;
     break;
    case OleDbType.VarChar:
     cmdType = (typeName == "char") ? SqlDbType.Char : SqlDbType.VarChar;
     break;
    case OleDbType.LongVarChar:
     cmdType = SqlDbType.Text;
     break;
    case OleDbType.VarWChar:
     cmdType = (typeName == "nchar") ? SqlDbType.NChar : SqlDbType.NVarChar;
     break;
    case OleDbType.LongVarWChar:
     cmdType = SqlDbType.NText;
     break;
    case OleDbType.VarBinary:
     cmdType = (typeName == "binary") ? SqlDbType.Binary : SqlDbType.VarBinary;
     break;
    case OleDbType.LongVarBinary:
     cmdType = SqlDbType.Image;
     break;
   }
   return cmdType;
  }

  /// <summary>
  /// Converts the OleDb parameter direction
  /// </summary>
  /// <param name="oledbDirection">The integer parameter direction</param>
  /// <returns>A ParameterDirection</returns>
  private static ParameterDirection GetParameterDirection(short oledbDirection)
  {
   ParameterDirection pd;
   switch (oledbDirection)
   {
    case 1:
     pd = ParameterDirection.Input;
     break;
    case 2: //或者干脆注释掉 case 2 的全部
     pd = ParameterDirection.Output; //是这里的问题
     goto default; //我加的这句话
     //break; //我注释掉的这句话
    case 4:
     pd = ParameterDirection.ReturnValue;
     break;
    default:
     pd = ParameterDirection.InputOutput;
     break;
   }
   return pd;
  }
}

#endregion

/// <summary>
/// The SqlHelper class is intended to encapsulate high performance, scalable best practices for
/// common uses of SqlClient
/// </summary>
public sealed class SqlHelper
{
  /// <summary>
  /// Calls the SqlCommandBuilder.DeriveParameters, doing any setup and cleanup necessary
  /// </summary>
  /// <param name="cmd">The SqlCommand referencing the stored procedure from which the parameter information is to be derived. The derived parameters are added to the Parameters collection of the SqlCommand. </param>
  public static void DeriveParameters(SqlCommand cmd)
  {
   new SqlServer().DeriveParameters(cmd);
  }

#region Private constructor

  // Since this class provides only static methods, make the default constructor private to prevent
  // instances from being created with "new SqlHelper()"
  private SqlHelper()
  {
  }

#endregion Private constructor

#region GetParameter

  /// <summary>
  /// Get a SqlParameter for use in a SQL command
  /// </summary>
  /// <param name="name">The name of the parameter to create</param>
  /// <param name="value">The value of the specified parameter</param>
  /// <returns>A SqlParameter object</returns>
  public static SqlParameter GetParameter(string name, object value)
  {
   return (SqlParameter) (new SqlServer().GetParameter(name, value));
  }

  /// <summary>
  /// Get a SqlParameter for use in a SQL command
  /// </summary>
  /// <param name="name">The name of the parameter to create</param>
  /// <param name="dbType">The System.Data.DbType of the parameter</param>
  /// <param name="size">The size of the parameter</param>
  /// <param name="direction">The System.Data.ParameterDirection of the parameter</param>
  /// <returns>A SqlParameter object</returns>
  public static SqlParameter GetParameter(string name, DbType dbType, int size, ParameterDirection direction)
  {
   return (SqlParameter) (new SqlServer().GetParameter(name, dbType, size, direction));
  }

  /// <summary>
  /// Get a SqlParameter for use in a SQL command
  /// </summary>
  /// <param name="name">The name of the parameter to create</param>
  /// <param name="dbType">The System.Data.DbType of the parameter</param>
  /// <param name="size">The size of the parameter</param>
  /// <param name="sourceColumn">The source column of the parameter</param>
  /// <param name="sourceVersion">The System.Data.DataRowVersion of the parameter</param>
  /// <returns>A SqlParameter object</returns>
  public static SqlParameter GetParameter(string name, DbType dbType, int size, string sourceColumn, DataRowVersion sourceVersion)
  {
   return (SqlParameter) new SqlServer().GetParameter(name, dbType, size, sourceColumn, sourceVersion);
  }

#endregion

#region ExecuteNonQuery

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset) against the database specified in
  /// the connection string
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int result = ExecuteNonQuery(command);
  /// </remarks>
  /// <param name="command">The SqlCommand to execute</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlCommand command)
  {
   return new SqlServer().ExecuteNonQuery(command);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in
  /// the connection string
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteNonQuery(connectionString, commandType, commandText);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string
  /// using the provided parameters
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteNonQuery(connectionString, commandType, commandText, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in
  /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored prcedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteNonQuery(connectionString, spName, parameterValues);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteNonQuery(connection, commandType, commandText);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteNonQuery(connection, commandType, commandText, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteNonQuery(connection, spName, parameterValues);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteNonQuery(transaction, commandType, commandText);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteNonQuery(transaction, commandType, commandText, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified
  /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteNonQuery(transaction, spName, parameterValues);
  }

#endregion ExecuteNonQuery

#region ExecuteDataset

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// DataSet ds = ExecuteDataset(command);
  /// </remarks>
  /// <param name="command">The SqlCommand to execute</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlCommand command)
  {
   return new SqlServer().ExecuteDataset(command);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteDataset(connectionString, commandType, commandText);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteDataset(connectionString, commandType, commandText, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteDataset(connectionString, spName, parameterValues);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteDataset(connection, commandType, commandText);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteDataset(connection, commandType, commandText, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteDataset(connection, spName, parameterValues);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteDataset(transaction, commandType, commandText);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteDataset(transaction, commandType, commandText, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
  /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteDataset(transaction, spName, parameterValues);
  }

#endregion ExecuteDataset

#region ExecuteReader

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// SqlDataReader dr = ExecuteReader(command);
  /// </remarks>
  /// <param name="command">The SqlCommand to execute</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlCommand command)
  {
   return new SqlServer().ExecuteReader(command) as SqlDataReader;
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteReader(connectionString, commandType, commandText) as SqlDataReader;
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteReader(connectionString, commandType, commandText, commandParameters) as SqlDataReader;
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteReader(connectionString, spName, parameterValues) as SqlDataReader;
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteReader(connection, commandType, commandText) as SqlDataReader;
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteReader(connection, commandType, commandText, commandParameters) as SqlDataReader;
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteReader(connection, spName, parameterValues) as SqlDataReader;
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteReader(transaction, commandType, commandText) as SqlDataReader;
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteReader(transaction, commandType, commandText, commandParameters) as SqlDataReader;
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
  /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteReader(transaction, spName, parameterValues) as SqlDataReader;
  }

#endregion ExecuteReader

#region ExecuteScalar

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int orderCount = (int)ExecuteScalar(command);
  /// </remarks>
  /// <param name="command">The SqlCommand to execute</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlCommand command)
  {
   // Pass through the call providing null for the set of SqlParameters
   return new SqlServer().ExecuteScalar(command);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return new SqlServer().ExecuteScalar(connectionString, commandType, commandText);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteScalar(connectionString, commandType, commandText, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in
  /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteScalar(connectionString, spName, parameterValues);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteScalar(connection, commandType, commandText);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteScalar(connection, commandType, commandText, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteScalar(connection, spName, parameterValues);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteScalar(transaction, commandType, commandText);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteScalar(transaction, commandType, commandText, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified
  /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteScalar(transaction, spName, parameterValues);
  }

#endregion ExecuteScalar

#region ExecuteXmlReader

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// XmlReader r = ExecuteXmlReader(SqlCommand command);
  /// </remarks>
  /// <param name="command">The SqlCommand to execute</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlCommand command)
  {
   return new SqlServer().ExecuteXmlReader(command);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteXmlReader(connection, commandType, commandText);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteXmlReader(connection, commandType, commandText, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure using "FOR XML AUTO"</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteXmlReader(connection, spName, parameterValues);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
  {
   return new SqlServer().ExecuteXmlReader(transaction, commandType, commandText);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   return new SqlServer().ExecuteXmlReader(transaction, commandType, commandText, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
  /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)
  {
   return new SqlServer().ExecuteXmlReader(transaction, spName, parameterValues);
  }

#endregion ExecuteXmlReader

#region FillDataset

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
  /// </remarks>
  /// <param name="command">The SqlCommand to execute</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)</param>
  public static void FillDataset(SqlCommand command, DataSet dataSet, string[] tableNames)
  {
   new SqlServer().FillDataset(command, dataSet, tableNames);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)</param>
  public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
  {
   new SqlServer().FillDataset(connectionString, commandType, commandText, dataSet, tableNames);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  public static void FillDataset(string connectionString, CommandType commandType,
                                 string commandText, DataSet dataSet, string[] tableNames,
                                 params SqlParameter[] commandParameters)
  {
   new SqlServer().FillDataset(connectionString, commandType, commandText, dataSet, tableNames, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  public static void FillDataset(string connectionString, string spName,
                                 DataSet dataSet, string[] tableNames, params object[] parameterValues)
  {
   new SqlServer().FillDataset(connectionString, spName, dataSet, tableNames, parameterValues);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  public static void FillDataset(SqlConnection connection, CommandType commandType,
                                 string commandText, DataSet dataSet, string[] tableNames)
  {
   new SqlServer().FillDataset(connection, commandType, commandText, dataSet, tableNames);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  public static void FillDataset(SqlConnection connection, CommandType commandType,
                                 string commandText, DataSet dataSet, string[] tableNames, params SqlParameter[] commandParameters)
  {
   new SqlServer().FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  public static void FillDataset(SqlConnection connection, string spName,
                                 DataSet dataSet, string[] tableNames, params object[] parameterValues)
  {
   new SqlServer().FillDataset(connection, spName, dataSet, tableNames, parameterValues);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  public static void FillDataset(SqlTransaction transaction, CommandType commandType,
                                 string commandText, DataSet dataSet, string[] tableNames)
  {
   new SqlServer().FillDataset(transaction, commandType, commandText, dataSet, tableNames);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  public static void FillDataset(SqlTransaction transaction, CommandType commandType,
                                 string commandText, DataSet dataSet, string[] tableNames, params SqlParameter[] commandParameters)
  {
   new SqlServer().FillDataset(transaction, commandType, commandText, dataSet, tableNames, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
  /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.:
  /// FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  public static void FillDataset(SqlTransaction transaction, string spName,
                                 DataSet dataSet, string[] tableNames, params object[] parameterValues)
  {
   new SqlServer().FillDataset(transaction, spName, dataSet, tableNames, parameterValues);
  }

#endregion

#region UpdateDataset

  /// <summary>
  /// Executes the respective command for each inserted, updated, or deleted row in the DataSet.
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
  /// </remarks>
  /// <param name="insertCommand">A valid transact-SQL statement or stored procedure to insert new records into the data source</param>
  /// <param name="deleteCommand">A valid transact-SQL statement or stored procedure to delete records from the data source</param>
  /// <param name="updateCommand">A valid transact-SQL statement or stored procedure used to update records in the data source</param>
  /// <param name="dataSet">The DataSet used to update the data source</param>
  /// <param name="tableName">The DataTable used to update the data source.</param>
  public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
  {
   new SqlServer().UpdateDataset(insertCommand, deleteCommand, updateCommand, dataSet, tableName);
  }

  /// <summary>
  /// Executes the System.Data.SqlClient.SqlCommand for each inserted, updated, or deleted row in the DataSet also implementing RowUpdating and RowUpdated Event Handlers
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// SqlRowUpdatingEventHandler rowUpdating = new SqlRowUpdatingEventHandler( OnRowUpdating );
  /// SqlRowUpdatedEventHandler rowUpdated = new SqlRowUpdatedEventHandler( OnRowUpdated );
  /// adoHelper.UpdateDataSet(sqlInsertCommand, sqlDeleteCommand, sqlUpdateCommand, dataSet, "Order", rowUpdating, rowUpdated);
  /// </remarks>
  /// <param name="insertCommand">A valid transact-SQL statement or stored procedure to insert new records into the data source</param>
  /// <param name="deleteCommand">A valid transact-SQL statement or stored procedure to delete records from the data source</param>
  /// <param name="updateCommand">A valid transact-SQL statement or stored procedure used to update records in the data source</param>
  /// <param name="dataSet">The DataSet used to update the data source</param>
  /// <param name="tableName">The DataTable used to update the data source.</param>
  /// <param name="rowUpdating">The AdoHelper.RowUpdatingEventHandler or null</param>
  /// <param name="rowUpdated">The AdoHelper.RowUpdatedEventHandler or null</param>
  public static void UpdateDataset(IDbCommand insertCommand, IDbCommand deleteCommand, IDbCommand updateCommand,
                                   DataSet dataSet, string tableName, AdoHelper.RowUpdatingHandler rowUpdating, AdoHelper.RowUpdatedHandler rowUpdated)
  {
   new SqlServer().UpdateDataset(insertCommand, deleteCommand, updateCommand, dataSet, tableName, rowUpdating, rowUpdated);
  }

#endregion

#region CreateCommand

  /// <summary>
  /// Simplify the creation of a Sql command object by allowing
  /// a stored procedure and optional parameters to be provided
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// SqlCommand command = CreateCommand(connenctionString, "AddCustomer", "CustomerID", "CustomerName");
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>
  /// <returns>A valid SqlCommand object</returns>
  public static SqlCommand CreateCommand(string connectionString, string spName, params string[] sourceColumns)
  {
   return new SqlServer().CreateCommand(connectionString, spName, sourceColumns) as SqlCommand;
  }

  /// <summary>
  /// Simplify the creation of a Sql command object by allowing
  /// a stored procedure and optional parameters to be provided
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>
  /// <returns>A valid SqlCommand object</returns>
  public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)
  {
   return new SqlServer().CreateCommand(connection, spName, sourceColumns) as SqlCommand;
  }

  /// <summary>
  /// Simplify the creation of a Sql command object by allowing
  /// a stored procedure and optional parameters to be provided
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// SqlCommand command = CreateCommand(connenctionString, "AddCustomer", "CustomerID", "CustomerName");
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandText">A valid SQL string to execute</param>
  /// <param name="commandType">The CommandType to execute (i.e. StoredProcedure, Text)</param>
  /// <param name="commandParameters">The SqlParameters to pass to the command</param>
  /// <returns>A valid SqlCommand object</returns>
  public static SqlCommand CreateCommand(string connectionString, string commandText, CommandType commandType, params SqlParameter[] commandParameters)
  {
   return new SqlServer().CreateCommand(connectionString, commandText, commandType, commandParameters) as SqlCommand;
  }

  /// <summary>
  /// Simplify the creation of a Sql command object by allowing
  /// a stored procedure and optional parameters to be provided
  /// </summary>
  /// <remarks>
  /// e.g.:
  /// SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="commandText">A valid SQL string to execute</param>
  /// <param name="commandType">The CommandType to execute (i.e. StoredProcedure, Text)</param>
  /// <param name="commandParameters">The SqlParameters to pass to the command</param>
  /// <returns>A valid SqlCommand object</returns>
  public static SqlCommand CreateCommand(SqlConnection connection, string commandText, CommandType commandType, params SqlParameter[] commandParameters)
  {
   return new SqlServer().CreateCommand(connection, commandText, commandType, commandParameters) as SqlCommand;
  }

#endregion

#region ExecuteNonQueryTypedParams

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will assign the parameter values based on row values.
  /// </summary>
  /// <param name="command">The SqlCommand to execute</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQueryTypedParams(SqlCommand command, DataRow dataRow)
  {
   return new SqlServer().ExecuteNonQueryTypedParams(command, dataRow);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteNonQueryTypedParams(connectionString, spName, dataRow);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteNonQueryTypedParams(connection, spName, dataRow);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified
  /// SqlTransaction using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="transaction">A valid SqlTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteNonQueryTypedParams(transaction, spName, dataRow);
  }

#endregion

#region ExecuteDatasetTypedParams

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will assign the parameter values based on row values.
  /// </summary>
  /// <param name="command">The SqlCommand to execute</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDatasetTypedParams(SqlCommand command, DataRow dataRow)
  {
   return new SqlServer().ExecuteDatasetTypedParams(command, dataRow);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteDatasetTypedParams(connectionString, spName, dataRow);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the dataRow column values as the store procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteDatasetTypedParams(connection, spName, dataRow);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="transaction">A valid SqlTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteDatasetTypedParams(transaction, spName, dataRow);
  }

#endregion

#region ExecuteReaderTypedParams

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will assign the parameter values based on parameter order.
  /// </summary>
  /// <param name="command">The SqlCommand toe execute</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReaderTypedParams(SqlCommand command, DataRow dataRow)
  {
   return new SqlServer().ExecuteReaderTypedParams(command, dataRow) as SqlDataReader;
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteReaderTypedParams(connectionString, spName, dataRow) as SqlDataReader;
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteReaderTypedParams(connection, spName, dataRow) as SqlDataReader;
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="transaction">A valid SqlTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteReaderTypedParams(transaction, spName, dataRow) as SqlDataReader;
  }

#endregion

#region ExecuteScalarTypedParams

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will assign the parameter values based on parameter order.
  /// </summary>
  /// <param name="command">The SqlCommand to execute</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalarTypedParams(SqlCommand command, DataRow dataRow)
  {
   return new SqlServer().ExecuteScalarTypedParams(command, dataRow);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteScalarTypedParams(connectionString, spName, dataRow);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteScalarTypedParams(connection, spName, dataRow);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="transaction">A valid SqlTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteScalarTypedParams(transaction, spName, dataRow);
  }

#endregion

#region ExecuteXmlReaderTypedParams

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will assign the parameter values based on parameter order.
  /// </summary>
  /// <param name="command">The SqlCommand to execute</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReaderTypedParams(SqlCommand command, DataRow dataRow)
  {
   return new SqlServer().ExecuteXmlReaderTypedParams(command, dataRow);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteXmlReaderTypedParams(connection, spName, dataRow);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="transaction">A valid SqlTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
  {
   return new SqlServer().ExecuteXmlReaderTypedParams(transaction, spName, dataRow);
  }

#endregion
}

/// <summary>
/// SqlHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the
/// ability to discover parameters for stored procedures at run-time.
/// </summary>
public sealed class SqlHelperParameterCache
{
#region private constructor

  //Since this class provides only static methods, make the default constructor private to prevent
  //instances from being created with "new SqlHelperParameterCache()"
  private SqlHelperParameterCache()
  {
  }

#endregion constructor

#region caching functions

  /// <summary>
  /// Add parameter array to the cache
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters to be cached</param>
  public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)
  {
   new SqlServer().CacheParameterSet(connectionString, commandText, commandParameters);
  }

  /// <summary>
  /// Retrieve a parameter array from the cache
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An array of SqlParamters</returns>
  public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)
  {
   ArrayList tempValue = new ArrayList();
   IDataParameter[] sqlP = new SqlServer().GetCachedParameterSet(connectionString, commandText);
   foreach (IDataParameter parameter in sqlP)
   {
    tempValue.Add(parameter);
   }
   return (SqlParameter[]) tempValue.ToArray(typeof (SqlParameter));
  }

#endregion caching functions

#region Parameter Discovery Functions

  /// <summary>
  /// Retrieves the set of SqlParameters appropriate for the stored procedure
  /// </summary>
  /// <remarks>
  /// This method will query the database for this information, and then store it in a cache for future requests.
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
  /// <returns>An array of SqlParameters</returns>
  public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
  {
   ArrayList tempValue = new ArrayList();
   foreach (IDataParameter parameter in new SqlServer().GetSpParameterSet(connectionString, spName, includeReturnValueParameter))
   {
    tempValue.Add(parameter);
   }
   return (SqlParameter[]) tempValue.ToArray(typeof (SqlParameter));
  }

  /// <summary>
  /// Retrieves the set of SqlParameters appropriate for the stored procedure
  /// </summary>
  /// <remarks>
  /// This method will query the database for this information, and then store it in a cache for future requests.
  /// </remarks>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
  /// <returns>An array of SqlParameters</returns>
  /// <exception cref="System.ArgumentNullException">Thrown if spName is null</exception>
  /// <exception cref="System.ArgumentNullException">Thrown if connection is null</exception>
  public static SqlParameter[] GetSpParameterSet(IDbConnection connection, string spName, bool includeReturnValueParameter)
  {
   ArrayList tempValue = new ArrayList();
   foreach (IDataParameter parameter in new SqlServer().GetSpParameterSet(connection, spName, includeReturnValueParameter))
   {
    tempValue.Add(parameter);
   }
   return (SqlParameter[]) tempValue.ToArray(typeof (SqlParameter));
  }

#endregion Parameter Discovery Functions
}

/// <summary>
/// The Odbc class is intended to encapsulate high performance, scalable best practices for
/// common uses of the Odbc ADO.NET provider. It is created using the abstract factory in AdoHelper
/// </summary>
public class Odbc : AdoHelper
{
// used for correcting Call syntax for stored procedures in ODBC
private static Regex _regExpr = new Regex(@"/{.*call|CALL/s/w+.*}", RegexOptions.Compiled);

  /// <summary>
  /// Create an Odbc Helper. Needs to be a default constructor so that the Factory can create it
  /// </summary>
  public Odbc()
  {
  }

#region Overrides

  /// <summary>
  /// Returns an array of OdbcParameters of the specified size
  /// </summary>
  /// <param name="size">size of the array</param>
  /// <returns>The array of OdbcParameters</returns>
  protected override IDataParameter[] GetDataParameters(int size)
  {
   return new OdbcParameter[size];
  }

  /// <summary>
  /// Returns an OdbcConnection object for the given connection string
  /// </summary>
  /// <param name="connectionString">The connection string to be used to create the connection</param>
  /// <returns>An OdbcConnection object</returns>
  public override IDbConnection GetConnection(string connectionString)
  {
   return new OdbcConnection(connectionString);
  }

  /// <summary>
  /// Returns an OdbcDataAdapter object
  /// </summary>
  /// <returns>The OdbcDataAdapter</returns>
  public override IDbDataAdapter GetDataAdapter()
  {
   return new OdbcDataAdapter();
  }

   if (!(cmd is OdbcCommand))
    throw new ArgumentException("The command provided is not a OdbcCommand instance.", "cmd");
   if (cmd.Connection.State != ConnectionState.Open)
   {
    cmd.Connection.Open();
    mustCloseConnection = true;
   }

OdbcCommandBuilder.DeriveParameters((OdbcCommand) cmd);

   if (mustCloseConnection)
   {
    cmd.Connection.Close();
   }
  }

  /// <summary>
  /// Returns an OdbcParameter object
  /// </summary>
  /// <returns>The OdbcParameter object</returns>
  public override IDataParameter GetParameter()
  {
   return new OdbcParameter();
  }

  /// <summary>
  /// This cleans up the parameter syntax for an ODBC call. This was split out from PrepareCommand so that it could be called independently.
  /// </summary>
  /// <param name="command">An IDbCommand object containing the CommandText to clean.</param>
  public override void CleanParameterSyntax(IDbCommand command)
  {
   string call = " call ";

   if (command.CommandType == CommandType.StoredProcedure)
   {
    if (!_regExpr.Match(command.CommandText).Success && // It does not like like {call sp_name() }
     command.CommandText.Trim().IndexOf(" ") == -1) // If there's only a stored procedure name
    {
     // If there's only a stored procedure name
     StringBuilder par = new StringBuilder();
     if (command.Parameters.Count != 0)
     {
      bool isFirst = true;
      bool hasParameters = false;

      for (int i = 0; i < command.Parameters.Count; i++)
      {
       OdbcParameter p = command.Parameters[i] as OdbcParameter;
       if (p.Direction != ParameterDirection.ReturnValue)
       {
        if (isFirst)
        {
         isFirst = false;
         par.Append("(?");
        }
        else
        {
         par.Append(",?");
        }
        hasParameters = true;
       }
       else
       {
        call = " ? = call ";
       }
      }
      if (hasParameters)
      {
       par.Append(")");
      }
     }
     command.CommandText = "{" + call + command.CommandText + par.ToString() + " }";
    }
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the provided IDbConnection.
  /// </summary>
  /// <example>
  /// <code>
  /// XmlReader r = helper.ExecuteXmlReader(command);
  /// </code></example>
  /// <param name="command">The IDbCommand to execute</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public override XmlReader ExecuteXmlReader(IDbCommand command)
  {
   bool mustCloseConnection = false;

   if (command.Connection.State != ConnectionState.Open)
   {
    command.Connection.Open();
    mustCloseConnection = true;
   }

CleanParameterSyntax(command);

OdbcDataAdapter da = new OdbcDataAdapter((OdbcCommand) command);
DataSet ds = new DataSet();

da.MissingSchemaAction = MissingSchemaAction.AddWithKey;
da.Fill(ds);

StringReader stream = new StringReader(ds.GetXml());

   if (mustCloseConnection)
   {
    command.Connection.Close();
   }

return new XmlTextReader(stream);
}

  /// <summary>
  /// Provider specific code to set up the updating/ed event handlers used by UpdateDataset
  /// </summary>
  /// <param name="dataAdapter">DataAdapter to attach the event handlers to</param>
  /// <param name="rowUpdatingHandler">The handler to be called when a row is updating</param>
  /// <param name="rowUpdatedHandler">The handler to be called when a row is updated</param>
  protected override void AddUpdateEventHandlers(IDbDataAdapter dataAdapter, RowUpdatingHandler rowUpdatingHandler, RowUpdatedHandler rowUpdatedHandler)
  {
   if (rowUpdatingHandler != null)
   {
    this.m_rowUpdating = rowUpdatingHandler;
    ((OdbcDataAdapter) dataAdapter).RowUpdating += new OdbcRowUpdatingEventHandler(RowUpdating);
   }

   if (rowUpdatedHandler != null)
   {
    this.m_rowUpdated = rowUpdatedHandler;
    ((OdbcDataAdapter) dataAdapter).RowUpdated += new OdbcRowUpdatedEventHandler(RowUpdated);
   }
  }

  /// <summary>
  /// Handles the RowUpdating event
  /// </summary>
  /// <param name="obj">The object that published the event</param>
  /// <param name="e">The OdbcRowUpdatingEventArgs</param>
  protected void RowUpdating(object obj, OdbcRowUpdatingEventArgs e)
  {
   base.RowUpdating(obj, e);
  }

  /// <summary>
  /// Handles the RowUpdated event
  /// </summary>
  /// <param name="obj">The object that published the event</param>
  /// <param name="e">The OdbcRowUpdatedEventArgs</param>
  protected void RowUpdated(object obj, OdbcRowUpdatedEventArgs e)
  {
   base.RowUpdated(obj, e);
  }

  /// <summary>
  /// Handle any provider-specific issues with BLOBs here by "washing" the IDataParameter and returning a new one that is set up appropriately for the provider.
  /// </summary>
  /// <param name="connection">The IDbConnection to use in cleansing the parameter</param>
  /// <param name="p">The parameter before cleansing</param>
  /// <returns>The parameter after it's been cleansed.</returns>
  protected override IDataParameter GetBlobParameter(IDbConnection connection, IDataParameter p)
  {
   // nothing special needed for ODBC...so far as we know now.
   return p;
  }

#endregion
}

/// <summary>
/// The OleDb class is intended to encapsulate high performance, scalable best practices for
/// common uses of the OleDb ADO.NET provider. It is created using the abstract factory in AdoHelper
/// </summary>
public class OleDb : AdoHelper
{
  /// <summary>
  /// Create an OleDb Helper. Needs to be a default constructor so that the Factory can create it
  /// </summary>
  public OleDb()
  {
  }

#region Overrides

  /// <summary>
  /// Returns an array of OleDbParameters of the specified size
  /// </summary>
  /// <param name="size">size of the array</param>
  /// <returns>The array of OdbcParameters</returns>
  protected override IDataParameter[] GetDataParameters(int size)
  {
   return new OleDbParameter[size];
  }

  /// <summary>
  /// Returns an OleDbConnection object for the given connection string
  /// </summary>
  /// <param name="connectionString">The connection string to be used to create the connection</param>
  /// <returns>An OleDbConnection object</returns>
  public override IDbConnection GetConnection(string connectionString)
  {
   return new OleDbConnection(connectionString);
  }

  /// <summary>
  /// Returns an OleDbDataAdapter object
  /// </summary>
  /// <returns>The OleDbDataAdapter</returns>
  public override IDbDataAdapter GetDataAdapter()
  {
   return new OleDbDataAdapter();
  }

if (!(cmd is OleDbCommand))
throw new ArgumentException("The command provided is not a OleDbCommand instance.", "cmd");

   if (cmd.Connection.State != ConnectionState.Open)
   {
    cmd.Connection.Open();
    mustCloseConnection = true;
   }

OleDbCommandBuilder.DeriveParameters((OleDbCommand) cmd);

   if (mustCloseConnection)
   {
    cmd.Connection.Close();
   }
  }

  /// <summary>
  /// Returns an OleDbParameter object
  /// </summary>
  /// <returns>The OleDbParameter object</returns>
  public override IDataParameter GetParameter()
  {
   return new OleDbParameter();
  }

  /// <summary>
  /// This cleans up the parameter syntax for an OleDb call. This was split out from PrepareCommand so that it could be called independently.
  /// </summary>
  /// <param name="command">An IDbCommand object containing the CommandText to clean.</param>
  public override void CleanParameterSyntax(IDbCommand command)
  {
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the provided IDbConnection.
  /// </summary>
  /// <example>
  /// <code>
  /// XmlReader r = helper.ExecuteXmlReader(command);
  /// </code></example>
  /// <param name="command">The IDbCommand to execute</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public override XmlReader ExecuteXmlReader(IDbCommand command)
  {
   bool mustCloseConnection = false;

   if (command.Connection.State != ConnectionState.Open)
   {
    command.Connection.Open();
    mustCloseConnection = true;
   }

CleanParameterSyntax(command);

OleDbDataAdapter da = new OleDbDataAdapter((OleDbCommand) command);
DataSet ds = new DataSet();

da.MissingSchemaAction = MissingSchemaAction.AddWithKey;
da.Fill(ds);

   StringReader stream = new StringReader(ds.GetXml());
   if (mustCloseConnection)
   {
    command.Connection.Close();
   }

return new XmlTextReader(stream);
}

  /// <summary>
  /// Provider specific code to set up the updating/ed event handlers used by UpdateDataset
  /// </summary>
  /// <param name="dataAdapter">DataAdapter to attach the event handlers to</param>
  /// <param name="rowUpdatingHandler">The handler to be called when a row is updating</param>
  /// <param name="rowUpdatedHandler">The handler to be called when a row is updated</param>
  protected override void AddUpdateEventHandlers(IDbDataAdapter dataAdapter, RowUpdatingHandler rowUpdatingHandler, RowUpdatedHandler rowUpdatedHandler)
  {
   if (rowUpdatingHandler != null)
   {
    this.m_rowUpdating = rowUpdatingHandler;
    ((OleDbDataAdapter) dataAdapter).RowUpdating += new OleDbRowUpdatingEventHandler(RowUpdating);
   }

   if (rowUpdatedHandler != null)
   {
    this.m_rowUpdated = rowUpdatedHandler;
    ((OleDbDataAdapter) dataAdapter).RowUpdated += new OleDbRowUpdatedEventHandler(RowUpdated);
   }
  }

  /// <summary>
  /// Handles the RowUpdating event
  /// </summary>
  /// <param name="obj">The object that published the event</param>
  /// <param name="e">The OleDbRowUpdatingEventArgs</param>
  protected void RowUpdating(object obj, OleDbRowUpdatingEventArgs e)
  {
   base.RowUpdating(obj, e);
  }

  /// <summary>
  /// Handles the RowUpdated event
  /// </summary>
  /// <param name="obj">The object that published the event</param>
  /// <param name="e">The OleDbRowUpdatedEventArgs</param>
  protected void RowUpdated(object obj, OleDbRowUpdatedEventArgs e)
  {
   base.RowUpdated(obj, e);
  }

  /// <summary>
  /// Handle any provider-specific issues with BLOBs here by "washing" the IDataParameter and returning a new one that is set up appropriately for the provider.
  /// </summary>
  /// <param name="connection">The IDbConnection to use in cleansing the parameter</param>
  /// <param name="p">The parameter before cleansing</param>
  /// <returns>The parameter after it's been cleansed.</returns>
  protected override IDataParameter GetBlobParameter(IDbConnection connection, IDataParameter p)
  {
   // nothing special needed for OleDb...as far as we know now
   return p;
  }

#endregion
}

/// <summary>
/// The Oracle class is intended to encapsulate high performance, scalable best practices for
/// common uses of the Oracle ADO.NET provider. It is created using the abstract factory in AdoHelper.
/// </summary>
public class Oracle : AdoHelper
{
  /// <summary>
  /// Create an Oracle Helper. Needs to be a default constructor so that the Factory can create it
  /// </summary>
  public Oracle()
  {
  }

#region Overrides

  /// <summary>
  /// Returns an array of OracleParameters of the specified size
  /// </summary>
  /// <param name="size">size of the array</param>
  /// <returns>The array of OracleParameters</returns>
  protected override IDataParameter[] GetDataParameters(int size)
  {
   return new OracleParameter[size];
  }

  /// <summary>
  /// Returns an OracleConnection object for the given connection string
  /// </summary>
  /// <param name="connectionString">The connection string to be used to create the connection</param>
  /// <returns>An OracleConnection object</returns>
  public override IDbConnection GetConnection(string connectionString)
  {
   return new OracleConnection(connectionString);
  }

  /// <summary>
  /// Returns an OracleDataAdapter object
  /// </summary>
  /// <returns>The OracleDataAdapter</returns>
  public override IDbDataAdapter GetDataAdapter()
  {
   return new OracleDataAdapter();
  }

if (!(cmd is OracleCommand))
throw new ArgumentException("The command provided is not an OracleCommand instance.", "cmd");

   if (cmd.Connection.State != ConnectionState.Open)
   {
    cmd.Connection.Open();
    mustCloseConnection = true;
   }

OracleCommandBuilder.DeriveParameters((OracleCommand) cmd);

   if (mustCloseConnection)
   {
    cmd.Connection.Close();
   }
  }

  /// <summary>
  /// Returns an OracleParameter object
  /// </summary>
  /// <returns>The OracleParameter object</returns>
  public override IDataParameter GetParameter()
  {
   OracleParameter parameter = new OracleParameter();
   parameter.Size = 255;
   return parameter;
  }

  /// <summary>
  /// Get an IDataParameter for use in a SQL command
  /// </summary>
  /// <param name="parameterName">The name of the parameter to create</param>
  /// <param name="value">The value of the specified parameter</param>
  /// <returns>An IDataParameter object</returns>
  public override IDataParameter GetParameter(string parameterName, object value)
  {
   OracleParameter parameter = new OracleParameter();
   parameter.ParameterName = parameterName;
   parameter.Value = value;
   parameter.Size = GetParameterSize(parameterName);
   return parameter;
  }

  /// <summary>
  /// This function will get and assemble the parameter's size dynamically from db or cache
  /// </summary>
  /// <param name="name">The parameter name</param>
  /// <returns>The size</returns>
  private int GetParameterSize(string name)
  {
   int Size = 255;
   return Size;
  }

  /// <summary>
  /// This cleans up the parameter syntax for an Oracle call. This was split out from PrepareCommand so that it could be called independently.
  /// </summary>
  /// <param name="command">An IDbCommand object containing the CommandText to clean.</param>
  public override void CleanParameterSyntax(IDbCommand command)
  {
   if (command.CommandType == CommandType.Text)
   {
    command.CommandText = command.CommandText.Replace("@", ":");
   }

   if (command.Parameters.Count > 0)
   {
    foreach (OracleParameter parameter in command.Parameters)
    {
     parameter.ParameterName = parameter.ParameterName.Replace("@", ":");
    }
   }
  }

  /// <summary>
  /// Execute an IDbCommand (that returns a resultset) against the provided IDbConnection.
  /// </summary>
  /// <example>
  /// <code>
  /// XmlReader r = helper.ExecuteXmlReader(command);
  /// </code></example>
  /// <param name="command">The IDbCommand to execute</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public override XmlReader ExecuteXmlReader(IDbCommand command)
  {
   bool mustCloseConnection = false;

   if (command.Connection.State != ConnectionState.Open)
   {
    command.Connection.Open();
    mustCloseConnection = true;
   }

CleanParameterSyntax(command);

OracleDataAdapter da = new OracleDataAdapter((OracleCommand) command);
DataSet ds = new DataSet();

da.MissingSchemaAction = MissingSchemaAction.AddWithKey;
da.Fill(ds);

   StringReader stream = new StringReader(ds.GetXml());
   if (mustCloseConnection)
   {
    command.Connection.Close();
   }

return new XmlTextReader(stream);
}

  /// <summary>
  /// Provider specific code to set up the updating/ed event handlers used by UpdateDataset
  /// </summary>
  /// <param name="dataAdapter">DataAdapter to attach the event handlers to</param>
  /// <param name="rowUpdatingHandler">The handler to be called when a row is updating</param>
  /// <param name="rowUpdatedHandler">The handler to be called when a row is updated</param>
  protected override void AddUpdateEventHandlers(IDbDataAdapter dataAdapter, RowUpdatingHandler rowUpdatingHandler, RowUpdatedHandler rowUpdatedHandler)
  {
   if (rowUpdatingHandler != null)
   {
    this.m_rowUpdating = rowUpdatingHandler;
    ((OracleDataAdapter) dataAdapter).RowUpdating += new OracleRowUpdatingEventHandler(RowUpdating);
   }

   if (rowUpdatedHandler != null)
   {
    this.m_rowUpdated = rowUpdatedHandler;
    ((OracleDataAdapter) dataAdapter).RowUpdated += new OracleRowUpdatedEventHandler(RowUpdated);
   }
  }

  /// <summary>
  /// Handles the RowUpdating event
  /// </summary>
  /// <param name="obj">The object that published the event</param>
  /// <param name="e">The OracleRowUpdatingEventArgs</param>
  protected void RowUpdating(object obj, OracleRowUpdatingEventArgs e)
  {
   base.RowUpdating(obj, e);
  }

  /// <summary>
  /// Handles the RowUpdated event
  /// </summary>
  /// <param name="obj">The object that published the event</param>
  /// <param name="e">The OracleRowUpdatedEventArgs</param>
  protected void RowUpdated(object obj, OracleRowUpdatedEventArgs e)
  {
   base.RowUpdated(obj, e);
  }

  /// <summary>
  /// Handle any provider-specific issues with BLOBs here by "washing" the IDataParameter and returning a new one that is set up appropriately for the provider.
  /// See MS KnowledgeBase article: http://support.microsoft.com/default.aspx?scid=kb;en-us;322796
  /// </summary>
  /// <param name="connection">The IDbConnection to use in cleansing the parameter</param>
  /// <param name="p">The parameter before cleansing</param>
  /// <returns>The parameter after it's been cleansed.</returns>
  protected override IDataParameter GetBlobParameter(IDbConnection connection, IDataParameter p)
  {
   OracleConnection clonedConnection = (OracleConnection) (((ICloneable) connection).Clone());

clonedConnection.Open();

   OracleCommand cmd = clonedConnection.CreateCommand();
   cmd.CommandText = "declare xx blob;begin dbms_lob.createtemporary(xx, false, 0);:tempblob := xx;end;";
   cmd.Parameters.Add(new OracleParameter("tempblob", OracleType.Blob)).Direction = ParameterDirection.Output;
   cmd.ExecuteNonQuery();

   OracleLob tempLob;
   tempLob = (OracleLob) (cmd.Parameters[0].Value);
   tempLob.BeginBatch(OracleLobOpenMode.ReadWrite);
   tempLob.Write((byte[]) (p.Value), 0, System.Runtime.InteropServices.Marshal.SizeOf(p.Value));
   tempLob.EndBatch();

OracleParameter op = new OracleParameter(p.ParameterName, OracleType.Blob);
op.Value = tempLob;

clonedConnection.Close();

return op;
}

#endregion
}
}

posted @ 2005-02-04 10:15 于斯人也阅读(305) 评论(0) 编辑收藏举报

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